Unit 6 Study Guide
1. The types of muscles are smooth, cardiac, and skeletal. 2. The muscle is made up of myofibrils that allow for muscle contraction. 3. The parts of the myofibrils that allow for it to extend out are called the sacomere. 4. The nerve cell that connects to several muscle fibers called a motor neuron. 5. The thick ones are protein myosin. The thin ones are protein actin. 6. The chemicals that stimulate the muscle to contract are called neurotransmitters 7. Acetylcholine contracts the muscles.
8. Acetylcholines are stored at the end of each motor neuron. 9. The combination of the motor neuron and the muscles it controls are called a motor unit. 10. The energy storing molecule found in the mitochondrion is ATP (adenosine triphoshate). 11. If there is a lack of ATP then there will be muscle cramps. 12. The chemical that builds in the muscle caused by strenuous exercise is lactic acid. 13. The pigment that causes blood to be red is hemoglobin. 14. The pigment that causes the muscles to be brown is myoglobin. 15. The discoloration and swelling in a muscle strain is caused by ruptured blood vessels. 16. After death where ATP decreased and muscles cannot relax the body then rigor mortis will take place. 17. A contraction then sudden relaxation of a muscle caused by a single stimulus is called a twitch. 18. The delay between the time the stimulus is applied and the time the muscle responds is called latent period. 19. Partially inflamed and swollen tendons are called tendonitis. 20. The immovable end of the joint is called the origin.
21. The movable end of the joint is called the insertion.
22. Muscular dystrophies is inherited disorder which causes the collapse of muscles.
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