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Physiology

5 days ago

How the Heart Works: The Science of Pumping Blood

Ever wonder how the heart pumps blood? It’s a complex organ, but here’s the short version: Electrical impulses trigger the heart’s pumping action, and many moving parts help oxygen-rich blood circulate. For students pursuing health careers, understanding heart function isn’t just fascinating — it’s foundational for the MCAT and professional programs. In honor of American Heart Month, we’re unpacking the complicated process of how the heart works. How the Heart Works The heart is one big muscle: a dedicated pump. It uses powerful muscular contractions to push about 2,000 gallons of blood through the body per day. But those contractions don’t happen randomly. The heart has its own built-in electrical system that controls every beat. Every Heartbeat Starts With Electricity Did you know that the heart has its own electrical power supply? It’s the sinus node, a tiny clump of specialized cells found in the right atrium. The sinus node fires about 60 to 100 rhythmic electrical signals every minute. It generates these signals as charged sodium, calcium and potassium ions flow in and out. This electrical stimulus triggers both atria to contract. The electrical impulse shoots down to the ventricles as the atrial blood is pushed into them. The ventricles then contract, pumping blood out of the heart while the atria get a blood refill. This sequence is one “pump” or heartbeat. Because the heart pumps blood with each contraction they cause, electrical impulses are key to healthy heart function. This is why medical teams use a defibrillator: a quick electric shock that stops cardiac arrhythmia (irregular heartbeat). The heart can then reset, letting the sinus node take back over and restore a regular rhythm. The Sinus Node: How Your Heart Keeps a Steady Beat When the sinus node works properly, it creates a steady pattern called the cardiac cycle: the pattern of the heart’s chambers tightening and relaxing to pump blood, from the start of one beat to the next. The heart’s rhythm is regulated by the sinus node — the heart’s own pacemaker. Each heartbeat has a relaxation phase (diastolic) when the chambers fill with blood and a contraction phase (systolic) when they pump it out. (This is where those two numbers in your blood pressure reading come from.) The atria and ventricles take turns — while one relaxes, the other contracts. The heart’s mechanical functions, from pumping blood to keeping pressure steady, depend on its electrical system, and it all starts with the sinus node. What Are the 12 Steps of Blood Flow Through the Heart? How is blood pumped away from the heart and brought back in? The process is complex, involving a crucial detour through the lungs. The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood flows through these chambers in 12 coordinated steps. Here’s the step-by-step flow: Deoxygenated blood flows into the heart through the vena cava. The blood enters the right atrium. The blood is propelled through the tricuspid valve. The blood flows into the right ventricle. It’s then pushed through the pulmonary valve. The pulmonary artery carries blood to the lungs for oxygenation. Oxygenated blood returns from the lungs to the heart through the pulmonary veins. The blood enters the left atrium. It then passes through the mitral valve. The blood enters the left ventricle. Blood is pushed through the aortic valve into the aorta. The aorta sends oxygenated blood out to the body. All of this happens in a second or less with a normal heart rate. Here’s a video illustrating the process. The heart’s one part of a larger body system devoted to getting blood where it needs to go, but it doesn’t work alone. Once blood leaves the heart, the circulatory system takes over. This network of blood vessels delivers oxygen and nutrients throughout your entire body. What Is the Circulatory System? The circulatory system is a network dedicated to moving oxygen-rich blood through the body and waste products out. This “blood highway” has two components: The heart: the hub and traffic control center Blood vessels: about 60,000 miles of veins, arteries and capillaries that form the routes for blood to travel outside the heart Veins transport blood to the heart, while arteries move it away. Capillaries trade oxygen and nutrients for carbon dioxide and waste throughout the body. Study Heart Function and Physiology With UF Online Understanding how the heart pumps blood — and how to keep it healthy — is central to many meaningful health careers

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Physiology

1 weeks ago

Allergies and the Immune System: What Happens Inside Your Body

Allergies are the worst. A nice walk outside? Not while there’s a high pollen alert. A quick cuddle with a corgi? No thank you, pet dander. A large bite of lobster Rangoon? Hope you brought your EpiPen. Count yourself lucky if you don’t suffer from seasonal or perennial allergies because, for the rest of us, they’re like a “Must Be This Tall to Ride” sign barring us from life’s simple pleasures. So, what makes the human body go haywire every allergy season? In this article, we’re exploring the physiological reactions following the body’s exposure to an allergen. Let’s take an in-depth look at allergies and the immune system. What Causes Allergies? Allergies happen when your immune system misidentifies a harmless substance (allergen) as a dangerous invader. This mix-up triggers a protective chain reaction designed to defend your body. When an allergen is inhaled, eaten or absorbed through the skin, your immune system may respond by producing special, allergen-specific immunoglobulin E (IgE) antibodies

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Aging

2 weeks ago

Debunking 7 Common Aging Myths (That You Probably Believed)

Growing up, you probably had a very specific picture of aging. Wrinkles and weight gain were inevitable. An obscene amount of hair would grow in (and around) your nose and ears. Some of these ideas were repeated so often that they likely started to feel like facts. But many popular aging myths don’t hold up when you look at the science behind them. Aging does bring real biological changes, but not always in the dramatic or limiting ways we’ve been led to expect. Let’s take a closer look at seven of the most common myths about aging — and what the research actually shows

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Pharmacology

2 weeks ago

Biotech and Pharma: The Power of Cross-Training

There are certain industries where, no matter your role, everything feels a little … boxed in. The sales department works on sales. Marketing focuses on marketing. But in biotech and pharma, work rarely stays in one lane. You might be focused on a single experiment when suddenly the next step hinges upon another team’s findings. Or maybe a colleague’s study stalls because something downstream wasn’t considered early on: not a mistake, just a limited perspective. Cross-training helps teams see beyond their own tasks and understand how their work fits into the larger process. How Biotech and Pharma Work Together To understand why cross-training matters, it helps to know how biotech and pharma interact

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Anatomy

3 weeks ago

Women in Medicine: 4 Pioneers Who Reshaped Anatomical Education

If you’ve ever paged through an anatomy textbook, studied a medical illustration or watched a surgeon at work, you’re witnessing the legacy of women who refused to stay on the sidelines and persistently fought to reshape medicine — long before medical schools opened their doors to them. In this article, we’ll explore the lives of four women pioneers in medicine whose work transformed anatomy — even when history didn’t initially give them the spotlight. #1 Elizabeth Blackwell (1821–1910) In the 1840s, women were excluded from most professions. Most schools and public colleges in the United States denied them formal education, dismissed them as unfit for science and limited their education to domestic subjects. This didn’t stop Elizabeth Blackwell, who became the first woman in the U.S. to earn a medical degree in 1849. Despite ongoing sexism and pushback, Dr. Blackwell persisted

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Careers

1 month ago

Becoming a Principal Investigator: How an MS Can Help

What is a principal investigator? These research leaders drive the medical and scientific breakthroughs that save lives. They secure funding for groundbreaking studies, design experiments, analyze results and publish findings that shape healthcare policy. From cancer research to vaccine development, principal investigators (PIs) turn scientific questions into answers that improve health outcomes worldwide. But this role requires strong credentials. Earning a Master of Science (MS) degree is often the first major step toward becoming a principal investigator. Here’s what principal investigators do, what it takes to become one and the salary you can expect in this career. What Does a Principal Investigator Do? Principal investigators oversee major studies from start to finish. Their work begins well before the research starts and continues long after the last beaker is cleaned and put away. While some leaders simply give instructions, PIs are hands-on leaders at every stage. Do you picture principal investigators spending all day pipetting samples in a lab? Think again

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Aging

1 month ago

What Can You Do With a Master’s in Gerontology? Career Paths in Aging and Geriatrics

If you’re interested in working with older adults, you’ve probably come across two closely related fields: gerontology and geriatrics. While both focus on aging, they lead to very different career paths. When you’re planning a career path for your foreseeable future, it’s important to really understand that difference. Gerontology often focuses on the biological, psychological and social aspects of aging. For example, a gerontologist might help design community programs for older adults, evaluate long-term care services or analyze policies that affect aging populations. Geriatrics, on the other hand, is a medical specialty that requires clinical training and licensure. So what can you actually do with a master’s degree in gerontology? And how does it connect to careers in geriatrics? Let’s break it down. What Can You Do With a Master’s in Gerontology? A master’s degree in gerontology (or a master’s in innovative aging studies) prepares you for careers that support aging populations in many types of roles, including: Non-clinical positions Leadership and management roles Care coordination and program oversight Research- and evaluation-focused work These careers are growing as demand increases for professionals who understand the complex needs of older adults. Graduates work in settings such as healthcare systems, community organizations, long-term care facilities, government agencies and research institutions. While job titles vary, the common thread is the ability to translate specialized knowledge related to aging into services that support older adults in everyday life. In other words, this degree doesn’t lock you into one job; it opens multiple paths. Gerontology Career Paths (Non-Clinical Roles) Gerontology careers focus on improving older adults’ quality of life and providing access to services, such as care coordination and community health initiatives (to name a few). Common non-clinical career paths include: Health services manager: Oversees healthcare operations, staffing and service delivery in aging services organizations and long-term care facilities Policy analyst: Analyzes and develops aging policies at the local, state or federal level Research analyst: Supports aging-focused research through data analysis, program evaluation and evidence-based reporting Social and community service manager: Plans and directs programs that support older adults through community organizations and social service agencies Recreational therapist: Designs and leads therapeutic activities that support physical, cognitive and emotional well-being among older adults (certification requirements may vary by role) Aging-focused social service professional: Works with older adults and families to connect them with resources and support services (some positions may require additional licensure) Geriatrics Career Paths (Clinical Route) Geriatrics is a medical specialty focused on diagnosing and treating age-related conditions, like dementia, osteoporosis and cardiovascular disease

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Aging

1 month ago

How Media Ageism Shapes Our Views of Aging

Feeble, grouchy, out of touch, forgetful, stubborn: These ageist stereotypes of older people show up everywhere. But where do these views come from? The media plays a large role in shaping our views — accurate or not — about aging and older adults. This creates insulting terminology, inadequate representation and negative or inaccurate depictions. Let’s explore some examples of media ageism and possible silver linings, including incremental changes and the opportunity to combat ageism as an advocate for older adults. How Does the Media Contribute to Ageism? Media has a broader reach today than ever before. Television (high-definition broadcast, cable and streaming) reaches 97% of American households: about 315 million people! Add in the internet, with its social media platforms and endless entertainment and news choices, and the media’s influence becomes impossible to ignore. With this reach and influence, the media has tremendous power to shape how we think — for better or worse. Let’s look at some examples of ageism in the media. Examples of Ageist Language in Media What one person finds offensive, another might not

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Physiology

1 month ago

8 Biotech Careers That Rely on Human Physiology

In biotech, living things hold the key to medical innovations. Equipped with human physiology knowledge, professionals can make a meaningful, real‑world impact while working in fast‑growing, high-paying biotech careers. Let’s look a little closer at the biotech field, related careers and what it takes to excel in them. What Is Biotech? Biotechnology uses living organisms to solve problems and improve lives. Often called “biotech,” this field brings together scientists, engineers and other experts to develop: Vaccines Medicines Cleaner energy Safer food Biotech professionals might use bacteria to produce insulin for diabetes patients or bioprint tissue to create cartilage, skin or blood vessels. Biotech touches nearly every aspect of modern life, making it a diverse and exciting area to build a career in. How Does Human Physiology Help in Biotech Careers? Human physiology knowledge helps biotech professionals understand how the body works. Without it, these professionals can’t tailor biotech innovations to real-world human needs

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Physiology

2 months ago

Healing Touch Therapy: The Science Behind Human Touch and Healing

When you feel invisible, there’s nothing quite like a warm embrace, a hand on your back or fingers laced with yours to remind you that you’re seen. Human touch has always mattered, and the medical community has understood its power for a long time. But recently, touch therapy has gained more mainstream recognition as a wellness practice and is getting its moment in the spotlight. A quick online search can connect you with a professional cuddler or touch therapist in minutes. But what exactly is touch therapy? And can consensual touch really support someone’s health? Today, we’re talking about healing touch therapy, including what it looks like in practice. We’ll even hear from someone with firsthand experience healing through touch. What Is Touch Therapy? Healing touch is a hands-on therapy that uses light or near-body contact to support physical, emotional and spiritual well-being. Practitioners work gently, sometimes without even making direct contact, to encourage a sense of calm and connection. The approach is rooted in the belief that energy flows throughout the body

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