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問題一覧
1
The type of muscle contraction in which the muscle fibers produce increased tension although the muscle neither shortens nor lengthens is called _______
isometric
2
Which of the following muscles is voluntary?
the muscle that extends the arm at the elbow
3
What is the ion released from the terminal cisternae that combines with troponin and removes the blocking action of tropomyosin, resulting in the formation of cross bridges?
Ca2+
4
The sequence of electrical changes that occurs along the sarcolemma when a muscle fiber is stimulated is known as the ______
action potential
5
Which type of skeletal muscle contains abundant quantities of glycogen?
fast glycolytic fibers
6
Which of the following statements about smooth muscle is true?
Fibers are small and spindle-shaped.
7
The space between the axon terminus of the neuron and the sarcolemma of the muscle fiber is ______
synaptic cleft
8
Which of the following is thought to be an autoimmune disease of acetylcholine receptors?
myasthenia gravis
9
All of the following terms refer to the ability to receive and respond to a stimulus EXCEPT ______
contractility
10
Which of the following best describes the composition of the structure known as a triad in a skeletal muscle fiber?
terminal cisterna, transverse tubule, and terminal cisterna
11
Which of the following substances increases in quantity during repetitive muscle contraction during oxygen deficit?
lactic acid
12
In the sliding filament model of muscle contraction, the myofilaments slide over each other, resulting in the overlapping of actin and _________
myosin
13
The functional unit of contraction in a skeletal muscle fiber is the _______
sarcomere
14
Myofilament cross bridges form when which two structures bond?
myosin heads and globular actin
15
The alternating contraction and relaxation of opposing layers of smooth muscle is referred to as ______
peristalsis
16
What is the cause of rigor mortis?
calcium influx into the sarcoplasm after death
17
An entire skeletal muscle is surrounded by
epimysium
18
Continued mild or partial contraction of a muscle that keeps it healthy and ready to respond is known as muscle _______
tone
19
Which one of the following binds calcium ions in a smooth muscle, causing contraction?
calmodulin
20
the refractory period in which the muscle will NOT contract if stimulated occurs during _____ of the muscle cell.
repolarization
21
Each skeletal muscle fiber is controlled by a neuron at a single _________
neuromuscular junction
22
Which of the following statements is INCORRECT?
Skeletal muscles are responsible for the pumping action of the heart.
23
A motor neuron along with all the muscle fibers it supplies is called a(n) _________
motor unit
24
Which of the following does NOT occur during skeletal muscle contraction?
Calcium binds to myosin heads.
25
Which of the following characteristics is unique to smooth muscle?
the absence of striations
26
Where does 95% of the energy needed for contraction come from during moderate exercise?
aerobic respiration
27
Which of the following is NOT a characteristic of skeletal muscle contraction?
It can contract for long periods of time without tiring.
28
During the phase of excitation-contraction coupling of skeletal muscle, what occurs immediately after the action potential spreads down the T tubule?
The sarcoplasmic reticulum releases calcium.
29
Which of the following allows recoil of the muscle fiber when contraction ends?
elastic filaments
30
Myoglobin ______
is an oxygen-storage molecule