Chapter 7 "test yourself"

Chapter 7 "test yourself" - Chapter 7 Test...

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Chapter 7 “Test Yourself” 1. What is muscle? - Muscle is made up of cells that can shorten or contract. 2. What are the three types of muscle and what are some of the general characteristics of each type? 1. Skeletal: Skeletal muscle is controlled by the conscious mind and moves bones of the skeleton so that the animal can move around. 2. Cardiac: Cardiac muscle is found only on the heart. It starts the heart beating long before an animal is born and keeps it up until the animal dies. 3. Smooth: Smooth muscle is found all over the body and n places such as the eyes, the air passage ways in the lungs, the stomach and intestines, the urinary bladder, the blood vessels, and the reproductive tract. It carries out most of the unconscious, internal movements that the body needs to maintain itself in good working order. 3. What is the difference between a tendon and an aponeurosis ? - Tendons are bandlike tough fibrous connective tissue that connects muscles to bones. Aponeuroses are broad sheets of fibrous connective tissue that connect muscles to bones. 4. What is the origin of a muscle? The insertion? - The origin of a muscle is where a muscle attachment site and is usually the most stable and does not move much. - The intersection is another muscle attachment site that undergoes the most movement when a muscle contracts. 5. Why might it be of clinical importance to know the origin and insertion of a muscle? - So the procedure is as precise as possible making it go smoothly and as planned. 6. Describe a skeletal muscle cell in terms of cell size, shape, number of nuclei, and appearance under the microscope. - Long - Thin fiber - Can be several inches long by are only 80 micrometers in diameter - Often called muscle fibers rather than cells - Have multiple nuclei (some more than 100) - Outer membrane called sacolemma - Muscle fiber interior made of hundreds or thousands of smaller myofibrils packed together lengthwise - Myofibrils themselves are composed of thousands of even tinier protein filaments 7. What are the differences among a skeletal muscle fiber, a skeletal muscle myofibril, and a
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This note was uploaded on 04/03/2012 for the course NRM 2406 taught by Professor Dabbert during the Spring '12 term at Texas Tech.

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Chapter 7 "test yourself" - Chapter 7 Test...

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