The resource, ''Reading How Stuff Works Modern Prosthetic Limbs (pdf)'' included in "Lesson 1 Skeletal System" is a part of "Unit 06 Musculoskeletal System" included in Health & Life Sciences HLS - Course 1.

Learn about how muscle contraction and lung recoil actually help the lungs change their volume with every breath! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Human Anatomy and Physiology (A&P) 241 is the first class in a two quarter sequence in which human anatomy and physiology are studied using a body systems approach with emphasis on the interrelationships between form and function at the gross and microscopic levels of organization. You can think of this course as –An Owneręs Guide to the Human Body”. My goal is to help you learn how your body works so that you can explain concepts to others and apply knowledge to novel situations (e.g. make informed decisions regarding your own health and those whom you care about). Youęll also learn how to evaluate scientific research that forms the basis of our understanding of human anatomy and physiology and gain an appreciation for what remains to be discovered. To accomplish these goals requires significant effort from both of us. Although you will need to commit information to memory, I will ask you to focus on learning for understanding and your assessments will reflect this emphasis.

The overall purpose of this preparatory course textbook is to help students familiarize with some terms and some basic concepts they will find later in the Human Anatomy and Physiology I course.

The organization and functioning of the human organism generally is discussed in terms of different levels of increasing complexity, from the smallest building blocks to the entire body. This Anatomy and Physiology preparatory course covers the foundations on the chemical level, and a basic introduction to cellular level, organ level, and organ system levels. There is also an introduction to homeostasis at the beginning.

Physiology The word physiology is from the Ancient Greek φυσιολογία (phusiología, "natural philosophy") and it is the study of how organisms perform their vital functions. An example is the study of how a muscle contracts or the force contracting muscles exert on the skeleton. It was introduced by French physician Jean Fernery in 1552. Physiology is built upon a tripod of sciences: physics, chemistry, and anatomy.

Dr. Andy Connolly from Stanford Medical School shows Sal what hyperplasia in colon tissue looks like

Learn about how hypertension can cause damage to the large/middle sized arteries as well as the small arteries and arterioles. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Learn 2 major heart problems that hypertension can cause. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Learn the most common symptoms (or lack thereof!) and the two major categories of hypertension. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Watch how blood gets diverted away from alveoli with low oxygen levels. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Paul Andersen explains how your body protects itself from invading viruses and bacteria. He starts by describing the nonspecific immune responses of skin and inflammation. He then explains how we use antibodies to disrupt the function of antigens and mark them for destruction.

Find out exactly how stretch increases force of contraction in end-diastole, whereas more calcium increased force of contraction in end-systole. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Find out exactly why air goes in and out of the lungs. Rishi is a pediatric infectious disease physician and works at Khan Academy.

This video details the important structures and functions of the integumentary system. The integumentary system includes the skin, hair and nails in humans.

Paul Andersen explains the importance and location of interstitial fluid. He describes both the hydrostatic and osmotic pressures that move fluid between the interstitial fluid and the capillary. He also explains the major function of the fluid for the movement of material into and out of the cell.

Find out how health professionals use short-hand for labs and the meaning of normal ranges. Rishi is a pediatric infectious disease physician and works at Khan Academy.

The resource , ''Isometric Paper (pdf)'' included in "Lesson 2 Engineering Graphics, Lesson 3 Engineering Graphics" is a part of "Unit 03 Cardiovascular and Respiratory Systems, Unit 05 Urinary and Reproductive Systems" included in Health & Life Sciences HLS - Course 2.

Remember the 3 key layers of a blood vessel (Tunica intima, Tunica media, and Tunica externa) and how arteries, veins, and capillaries are all different from one another. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Take a closer look at the heart, explore some of its interesting features and get to know the three layers that make up the heart. Rishi is a pediatric infectious disease physician and works at Khan Academy.