Anatomy and physiology, commonly called A&P, is a college-level science course that teaches you how the human body is built and how it works. It’s one of the most widely required prerequisites for healthcare programs, with over 450,000 students enrolling across the United States each year. If you’re looking into nursing, physical therapy, dental hygiene, or nearly any other health career, this class will almost certainly be on your checklist.
What the Course Actually Covers
The course pairs two closely related disciplines. Anatomy is the study of the body’s internal and external structures and their physical relationships to one another. Physiology is the study of what those structures do. In practice, you learn them together: you study the bones of the skeleton (anatomy), then learn how bone tissue grows, repairs itself, and stores minerals (physiology).
Most schools split the material into two semesters. A&P I typically introduces foundational concepts like levels of organization, homeostasis (how the body maintains stable internal conditions), and then moves into major systems such as the skeletal, muscular, integumentary (skin), and nervous systems. A&P II picks up with the endocrine system, cardiovascular system, respiratory system, digestive system, urinary system, lymphatic system and immunity, and reproduction. A running theme across both semesters is how these systems work together rather than in isolation.
Clinical connections are woven throughout. Instructors often tie basic science to real medical scenarios so you can see why the material matters. You might learn about connective tissue structure, for example, and then examine what goes wrong in genetic conditions like Marfan syndrome or Ehlers-Danlos syndrome, where defects in those fibers cause joint hypermobility or cardiovascular problems. These clinical correlations help you start thinking like a healthcare professional even in your first year of coursework.
What Happens in the Lab
A&P isn’t just a lecture class. Nearly every section includes a hands-on laboratory component, and the lab is where much of the learning clicks into place. Expect a mix of activities that range from quiet microscope work to full organ dissections.
Histology, the study of tissues under a microscope, is a staple. You’ll examine prepared slides of structures like the retina or tongue tissue, sketch what you see at different magnifications, and label specific features. Dissections are common too. Many programs use cow eyes, sheep hearts, or preserved cats and fetal pigs to let you identify muscles, nerves, blood vessels, and organs in three dimensions rather than just on a textbook page. In a cow eye dissection, for instance, you’d identify the sclera, cornea, and optic nerve on the outside, then cut into the eye to find the vitreous humor, retina, and iris.
Labs also include physiology experiments. You might test your own taste sensitivity by counting the number of papillae (tiny bumps) on a small section of your tongue: fewer than five in a one-centimeter circle makes you a “hypo-taster” who tolerates bitter flavors well, while more than fifteen makes you a “hyper-taster.” Other common activities include measuring blood pressure responses to exercise, testing reflexes, or tracking respiratory volumes with a spirometer. These exercises turn abstract lecture concepts into something you can observe in your own body.
Prerequisites You’ll Need
Most colleges require at least one preparatory course before you can register for A&P I. A cell biology course designed for health occupations is the most common prerequisite, and you’ll typically need a C-minus or better to move forward. Some schools also recommend or require an introductory chemistry course, since understanding chemical reactions and pH helps with physiology topics like digestion and cellular metabolism.
If your long-term goal is medical school, physician assistant school, or another advanced program, advisors often recommend taking the full majors-level biology and chemistry sequences instead of the health-occupations versions. These carry more weight on graduate applications and cover the material in greater depth.
Why the Course Has a Reputation for Difficulty
A&P is genuinely one of the toughest undergraduate courses by the numbers. The overall attrition rate sits between 30 and 40 percent nationally, meaning roughly 150,000 students out of 450,000 don’t pass on their first attempt. That’s one of the highest failure and withdrawal rates of any undergraduate course with comparable enrollment.
The difficulty comes from the sheer volume of material. You’re memorizing hundreds of anatomical terms, bone markings, muscle attachment points, and nerve pathways while simultaneously understanding physiological processes like how your kidneys filter blood or how electrical signals travel through the heart. The course demands both rote memorization and conceptual understanding, and students who lean too heavily on one approach at the expense of the other tend to struggle.
Study Strategies That Actually Work
The single most effective technique for A&P is active recall: forcing yourself to retrieve information from memory rather than passively rereading notes or highlighting a textbook. Students who practice active recall perform better on exams, including licensing exams later in their careers, compared to peers who rely on passive review. The process of pulling a fact from memory actually strengthens that memory, making it easier and longer-lasting to access next time.
Flashcards are the classic active recall tool, but anything that forces retrieval works. Cover a diagram and try to label it from memory. Quiz yourself out loud in the car. Study with a partner using a rapid-fire game where you describe a structure without naming it and the other person guesses. Distributed practice matters too: spreading your study sessions across multiple days produces significantly better retention than cramming the night before. For a class with this much material, short daily review sessions beat long weekend marathons every time.
Physical and visual tools also help with anatomy specifically. Coloring books designed for anatomy students, 3D anatomy apps that let you rotate and peel away layers of the body, and even modeling clay can make spatial relationships easier to grasp than flat textbook images alone.
Where A&P Leads
Virtually every health profession requires A&P as foundational coursework. Nursing, physical therapy, occupational therapy, dental hygiene, respiratory therapy, radiologic technology, athletic training, and paramedic programs all list it as a prerequisite. Your grade matters: most competitive programs expect a B or higher, and some set a hard cutoff at a C. Graduate-level health science programs typically require a cumulative GPA of 3.0, with no more than one C in any course.
Beyond checking a box for admission, the material itself becomes the language of your future career. When a nursing instructor explains heart failure or a physical therapy professor discusses rotator cuff injuries, they assume you already know the underlying anatomy and physiology. Students who invested deeply in A&P consistently report feeling more prepared when clinical coursework begins.