03 Skeletal Muscle Activity

Question 1

Special functional properties of muscle fibers
- Irritabilty
- Contractility
- Extensibility
- Elasticity

Question 2

• known as responsiveness
• the ability to receive and respond to a stimulus

Answer 2

irritability

Question 3

The ability to for sibling shorten when adequately stimulated

Answer 3

contractility

Question 4

ability of muscle fibers to stretch

Answer 4

extensibility

Question 5

ability to recoil and resume their resting length after being stretched

Answer 5

elasticity

Question 6

nerves stimulus and action potential
- Motor unit
- Axon
- Axon terminals
- Neuromuscular junction
- Synpatic cleft

Question 7

consist of one neuron and all the skeletal muscle fibers it stimulates

Answer 7

motor unit

Question 8

Long threadlike extension of the neuron

Answer 8

Axon

Question 9

branches of axon which forms junctions with the sarcolemma of a different muscle cell

Answer 9

Axon terminals

Question 10

contain synaptic vesicles filled with a chemical referred to as a neurotransmitter (acetylcholine/ ACh)

Answer 10

Neuromuscular junction

Question 11

gap between the nerve endings and the muscle fiber membranes filled with interstitial fluid

Answer 11

Synaptic cleft

Question 12

Muscle Responses to Increasingly Rapid Stimulation

The muscle goes through quick cycles of contraction with a short reaction phase for each

Answer 12

Unfused/Incomplete tetanus

Question 13

Muscle Responses to Increasingly Rapid Stimulation

contractions become continuous because the similar frequency is so high that the reaction phase disappears completely

Answer 13

Fused/Complete Tetanus

Question 14

Muscle Response to Stronger Stimuli

• When only a few cells are stimulated, the muscle as a whole contracts only slightly
• When all the motor units are active and all the muscle fibers are stimulated, the muscle contraction is as strong as it can get

Question 15

unable to contract, even though it is still being stimulated because of working without stress

Answer 15

muscle fatigue

Question 16

happens when a person is not able to take an oxygen fast enough to keep the fat muscles supplied with all the oxygen they need when they are working vigorously

Answer 16

oxygen deficit

Question 17

really occurs, but it happens when people literally collapse when their muscles become fatigue and could no longer work

Answer 17

True muscle fatigue