Muscle

Question 1

T/F during relaxation, the myofilaments are sliding past each other and the muscle shortens?

Answer 1

false

Question 2

The smallest stimulus required to induce an action potential in a muscle fiber`s plasma membrane is known as the:

Answer 2

threshold voltage

Question 3

a motor unit consists of:

Answer 3

a motor neuron and all of the muscle cells it innervates

Question 4

T/F Strong muscle contraction implies that many motor units are activated and each unit has maximally contracted

Answer 4

true

Question 5

condition in which muscle length changes, but the force produced stays the same

Answer 5

isotonic contraction

Question 6

1. force (in grams) produced by muscle contraction was displayed on the vertical axis
2. Time(msec) was displayed on the horizontal axis

Answer 6

Oscilloscope displayed

Question 7

what is the correct order of the phases of a muscle twith?

Answer 7

latent, contraction, relaxtion

Question 8

the force transducer in the simulation

Answer 8

converts the mechanical force of a contraction into an electrical signal

Question 9

when a muscle doesn’t have time to relax because of high frequency stimulation

Answer 9

tetanus

Question 10

T/F Optimum resting length will result in maximum force production

Answer 10

True

Question 11

condition in which muscle length does not change regardless of the amount of force generated by the muscle

Answer 11

Isometric contraction

Question 12

weight lifting is

Answer 12

direct phosphorylation

Question 13

marathons are

Answer 13

aerobic pathway

Question 14

25 meter swim is

Answer 14

anaerobic pathway

Question 15

A sacromere is the distance between two……..

Answer 15

Z discs

Question 16

The _____ contains only the actin filaments

Answer 16

I band

Question 17

the thicker filaments are the _____ filaments

Answer 17

myosin

Question 18

both actin and myosin are found in the ____

Answer 18

A band

Question 19

when muscle tension develops but the load is not moved

Answer 19

isometric contraction

Question 20

determined by alternating motor units of a muscle organ even when the muscle is at rest

Answer 20

tetanus

Question 21

When the muscle tension developed overcomes the load and muscle shortening occurs

Answer 21

isotonic contraction

Question 22

how a smooth increase in muscle force is produced

Answer 22

multiple motor units summation

Question 23

Continued sustained smooth contraction due to rapid stimulation

Answer 23

tentanus

Question 24

The final chemical messenger and trigger for muscle contraction. It binds to troponin

Answer 24

calcium ions

Question 25

a neurotransmitter released at motor end plates by the axon terminals

Answer 25

acetylcholine

Question 26

diffuses across the cell membrane resulting in depolarization

Answer 26

sodium ions

Question 27

activates synaptic vesicles in axon terminals to fuse with plasma membrane of axon terminal

Answer 27

calcium ions

Question 28

where the axon of a motor neuron connects with the muscle fibers

Answer 28

neuromuscular junction

Question 29

breaks down ACh into its own building blocks, rendering it inactive