chapter 9

Question 1

Z discs

Answer 1

seperates muscle sacromeres

Question 2

A band

Answer 2

contains the entire length of single thick filament

Question 3

I band

Answer 3

Isotropic bands. Light band that contains only the thin filament

Question 4

myosin

Answer 4

thick filament protein

Question 5

acetylcholinesterase

Answer 5

An enzyme that removes all acetylcholine particles that don’t immediately bind with the receptor and those that are doen activation. This helps the muscle to relax.

Question 6

Acetylcholine

Answer 6

neurotransmitter that binds to nicotinic receptors in the end plate. Nicotinic receptors open allowing for sodium channels

Question 7

sodium ions

Question 8

calcium ions

Answer 8

binds with troponin and moves tropomyosin out the way so that actin and myosin can react together

Question 9

neuromuscular junction

Answer 9

chemical synapse between nerve terminal and motor endplate

Question 10

isometric contraction

Answer 10

when muscle tensions overcomes the load and shortens, tension remains constant

Question 11

isotonic contraction

Answer 11

concentric: muscle development while shortening
eccentric: muscle development while lengthening

Question 12

motor unit summuation

Question 13

tetanus

Question 14

muscle tone

Answer 14

relaxed msucles are still almsot always slightly contracted. Keeps muscle firm, healthy, and ready to respond to any movement