Chapter 5

Question 1

What happens during a muscle contraction?

Answer 1

• The origin may be determined by another muscle
• The placement of the insertion determines the mechanical advantage

*There is rapid recruitment in a boxer’s punch

Question 2

During a twitch, which phase of a muscle contraction is Myosin pulls (power stroke) in?

Answer 2

Contraction Phase

Question 3

During a twitch, which phase of a muscle contraction is Calcium being actively transported in?

Answer 3

Refractory Phase

Question 4

During a twitch, which phase of a muscle contraction is Acetylcholinesterase released?

Answer 4

Relaxation Phase

Question 5

During a twitch, which phase of a muscle contraction is Calcium released?

Answer 5

Latent Phase

Question 6

Name the order involved in the initiation of a muscle contraction

Answer 6

1. An electrical impulse travels down the neuron
2. Acetylcholine is released from the synaptic knob of the neuron
3. Acetylcholine fits into the receptors on the relaxed muscle cell

Question 7

Cardiac Muscle Tissue

Answer 7

Striated, involuntary, branching

Question 8

Skeletal Muscle Tissue

Answer 8

Striated, voluntary, multiple nuclei

Question 9

Smooth Muscle Tissue

Answer 9

Non-striated, involuntary

Question 10

What are the possible causes of fatigue?

Answer 10

• Lack of glucose
• Lack of ATP
• Build up of lactic acid

Question 11

What group of muscles are synergists?

Answer 11

Temporalis and Masseter

Question 12

A person bringing part of the body forward is performing which muscle action?

Answer 12

Protraction

Question 13

What is the connective tissue that surrounds several muscles of an area, forming muscle compartments?

Answer 13

Fascia

Question 14

If you pour soup from your hand by holding the bowl in your palm and turning it upside down, what muscle action are you performing?

Answer 14

Pronation

Question 15

Which type of muscle tissue is voluntary and under conscious control?

Answer 15

Skeletal

Question 16

What muscle action means to raise the shoulders or close the jaw?

Answer 16

Elevation

Question 17

What muscle is not a muscle of the thorax and abdomen?

Answer 17

Orbicularis oris

Question 18

Which group of muscles are antagonists?

Answer 18

Masseter and platysma

Question 19

What combining form means muscle?

Answer 19

Myo/o

Question 20

Which type of muscle tissues performs anaerobic respiration?

Answer 20

Skeletal

Question 21

If a person points the soles of his or her feet away from each other, what muscle action is he or she performing?

Answer 21

Eversion

Question 22

Which term describes bending a body part posteriorly?

Answer 22

Extension

Question 23

Which statement about a muscle’s response to nerve stimulation is true?

Answer 23

• A muscle’s response to nerve stimulation is all or nothing
• A muscle’s response to nerve stimulation is based on the threshold amount of acetylcholine fitting into receptors

-A muscle’s response to nerve stimulation is ultimately responsible for conductivity and contractility

Question 24

What is an antagonist?

Answer 24

A muscle that has the opposite action