Health/Phys. Ed.

Science (X) - Health/Phys. Ed. (X) - Crash Course (X)

Meiosis: Where the Sex Starts | Crash Course Biology

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Hank gets down to the nitty gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic organisms.

Alkenes & Alkynes | Crash Course Chemistry

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Today Hank talks about the deliciousness of alkenes & alkynes, their structures, and how to remember which is which by simply knowing the alphabet. Also, he breaks down hydrogenation, halogenation, polymerization, and triglycerides all while helping us figure out the meaning of different names for fats.

The Skeletal System | Crash Course A&P 19

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In this episode, we learn about the skeletal system and why astronauts Scott Kelly and Mikhail Kornienko are out in space studying it. We review the anatomy of the skeletal system, including the flat, short, and irregular bones, and their individual arrangements of compact and spongy bone. We also review microanatomy of bones, particularly the osteons and their inner lamella. Finally, we learn about the process of bone remodeling, which is carried out by crews of osteocytes, osteoblasts, and osteoclasts.

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Joints | Crash Course A&P 20

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We continue our look at bones and the skeletal system with a more detailed look at our axial and appendicular skeleton. This episode also talks about the structural and functional classifications of our joints and the major types of body movement that they facilitate.

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Tissues, Part 1 | Crash Course A&P 2

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In this episode, Hank provides a brief history of histology and introduces the different types and functions of your body's tissues.

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The Heart, Part 1: Under Pressure | Crash Course A&P 25

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Your heart gets a lot of attention from poets, songwriters, and storytellers, but today we'll learn how it really works. The heart's ventricles, atria, and valves create a pump that maintains both high and low pressure to circulate blood from the heart to the body through your arteries, and bring it back to the heart through your veins. You'll also learn what your blood pressure measurements mean when we talk about systolic and diastolic blood pressure.

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Blood, Part 1: True Blood | Crash Course A&P 29

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Now that we've talked about your blood vessels, we're going to zoom in a little closer and talk about your blood itself. We'll start by outlining the basic components of blood, including erythrocytes, leukocytes, platelets, and plasma, as well as the basic process of hemostasis that stops bleeding, and how antigens are responsible for the blood type that you have.

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Great Glands | Your Endocrine System: Crash Course Biology

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Hank fills us in on the endocrine system. This system of glands produces and secretes different types of hormones directly into the bloodstream to regulate the body's growth, metabolism, and sexual development & function.

DNA Transcription and Translation | Crash Course Biology

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How does DNA allow our cells to build proteins? Hank imagines the secret recipes and instruction manuals that that help explain DNA transcription and translation. Of course, this is done through an elaborate Hot Pocket analogy.

Heredity | Crash Course Biology

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Hank discusses heredity, genetics, and reproduction. To demonstrate heredity, Hank gets help from his brother John to discuss inhereted traits and Mendelian genetics.

Tissues, Part 3: Connective Tissues | Crash Course A&P 4

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In which we discuss the most abundant and diverse of the four tissue types: connective tissue.

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Hearing & Balance | Crash Course A&P 17

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Continue on a journey through the sensory systems with a look at how your sense of hearing works. We follow sounds as they work there way into the ear, where they are registered and transformed into action potentials. This mechanism not only helps you hear but also helps maintain your equilibrium.

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Vision | Crash Course A&P 18

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Next stop on our tour of the sensory systems is vision. With a little help from an optical illusion, we take a look inside your eyes to try to figure out how your sense of vision works-and how it can be tricked.

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Muscles, Part 1: Muscle Cells | Crash Course A&P 21

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We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process called the sliding filament model. Your skeletal muscles are constructed like a rope made of bundles of protein fibers, and that the smallest strands are your actin and myosin myofilaments. Its their use of calcium and ATP that causes the binding and unbinding that makes sarcomeres contract and relax.

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