What type of muscle is in the image below?
What type of muscle is in the image below?
smooth muscle
skeletal muscle
cardiac muscle
What type of muscle is in the image below?
smooth muscle
skeletal muscle
cardiac muscle
3In a laboratory experiment, the resting membrane potential of a muscle is measured and is found to be more negative. Which of the following has occurred?
Isopolarization
Repolarization
Depolarization
Hyperpolarization
4Atrophy at the neuromuscular junction that naturally occurs with age would have what effect on muscles?
It would cause an increase in the amount of ACh released by the neurons to compensate.
It would decrease the number of action potentials sent to the muscle fiber.
It would stimulate muscle cramps.
It would stimulate the nervous system to increase the speed in which it sends action potentials to the muscle fiber.
5Alex is participating in a 50-meter dash. Predict the most important chemical process his muscles will rely on during this race.
Anaerobic respiration
Aerobic respiration
Creatine phosphate breakdown
Both anaerobic respiration and creatine phosphate breakdown are correct.
Which of the following statements concerning fast-twitch muscle fibers is true?
They have large deposits of myoglobin.
They are well adapted to aerobic metabolism.
They split ATP rapidly.
They have a well-developed blood supply.
7A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. What characteristic of the soleus muscles makes this so?
They make more use of aerobic respiration.
They don’t have as many blood capillaries per gram of tissue.
They have more glycogen in them.
They have smaller mitochondria.
8Movements of the body are usually smooth and occur at differing rates because
muscles of different sizes contract at different rates.
they are a mixture of isotonic and isometric contractions.
most muscle contractions closely resemble individual muscle twitches.
motor units contract out of phase at their own particular rates.
9If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be __________.
incomplete tetanus
fatigue
spasm
complete tetanus
10As you are lifting a box, someone places extra weight on top of it. For your muscle to continue contracting and lifting the box, the muscle must
recruit more muscle fibers.
lower its threshold.
shift from isometric to isotonic contraction.
reduce its wave summation.
Results for item 11.
11Which of the following is not an important function of calcium ions in skeletal muscle activity?
Exposure of the active sites on G actin
Release of acetylcholine from the presynaptic terminal
All of these are important functions of calcium ions in skeletal muscle contraction.
Depolarization of the sarcolemma
12What type of muscle is in the image below?
smooth muscle
skeletal muscle
cardiac muscle
13Which of the following is NOT an age-related change in skeletal muscle?
Loss of muscle strength
Loss of fast-twitch fibers
Loss of synapse surface area
Decreased recovery time
14Consider a chemical that blocks the action of acetylcholinesterase. What effect does this have on muscles?
The axons of the motor neurons would atrophy, and the muscle would weaken.
The muscle would have no way to relax, and spastic contractions would result.
It would cause action potentials to be inhibited, thereby rendering the muscle useless.
The body would increase its production of acetylcholine to compensate.
See the diagram below.
15Match A in the drop down.
16Match B in the drop down.
17Match C in the drop down.
18Match D in the drop down.
19When skeletal muscle is producing CO2 and water while making ATP, which chemical processes could be active at this time?
Aerobic respiration
Both anaerobic respiration and aerobic respiration are correct
Anaerobic respiration
Results for item 20.
20Which of the following is true?
The greatest amount of tension is achieved when actin and myosin do not overlap.
Overstretching a muscle will increase its tension.
Optimal actin and myosin overlap will produce maximal contraction.
The greater the overlap of actin and myosin, the stronger the contraction.
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