Question: Functions of astrocytes include all of the following, except
Answer Choices: responding to neural tissue damage.
conducting action potentials.
maintaining the blood-brain barrier.
guiding neuron development.
forming a three-dimensional framework for the CNS.
Answer: B – conducting action potentials
Question: Put the following structures in order from superficial to deep:
muscle fiber
perimysium
myofibril
fascicle
endomysium
epimysium
Answer Choices: 1, 3, 5, 6, 4, 2
6, 2, 5, 4, 1, 3
1, 5, 4, 3, 2, 6
2, 3, 1, 4, 6, 5
6, 2, 4, 5, 1, 3
Answer: E – 6, 2, 4, 5, 1, 3
Question: Which of the following is not a function of smooth muscle tissue?
Answer Choices: elevating hairs on the arm
moving food materials along the digestive tract
forcing blood from the heart into the major arteries
altering the diameter of the respiratory passageways
forcing urine out of the urinary tract
Answer: C – forcing blood from the heart into the major arteries
Question: Which of the following is a function of Heart Muscle?
Answer Choices: Pump Blood
Move Bones
Open Sphincters
Erect hair
Move materials in Digestive tract
Answer: A – Pump Blood
Question: Which of the following is a characteristic only of Heart Muscle cells?
Answer Choices: They are striated
They are multi-nucleated
They have intercalated disks
They have spindle shape
They are the longest muscle cells
Answer: C – They have intercalated disks
Question: A threshold stimulus is the
Answer Choices: depolarization necessary to cause an action potential.
hyperpolarization of an axon.
peak of an action potential.
electrical current that crosses the synaptic cleft.
resting potential.
Answer: A – depolarization necessary to cause an action potential
Question: After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as
Answer Choices: depolarization.
oxygen debt.
tetany.
treppe.
rigor mortis.
Answer: E – rigor mortis
Question: During anaerobic glycolysis
Answer Choices: carbohydrate is metabolized.
pyruvic acid is produced.
oxygen is not consumed.
ATP is produced.
All of the answers are correct.
Answer: E – All of the answers are correct
Question: During intense exercise, the amount of oxygen available for aerobic respiration is
Answer Choices: Limited
Not in short supply
Provided by the mitochondria
All provided by the circulatory system
Unlimited
Answer: A – Limited
Question: A resting muscle generates most of its ATP by
Answer Choices: glycogenolysis.
aerobic metabolism of fatty acids.
hydrolysis of creatine phosphate.
anaerobic respiration.
the tricarboxylic acid cycle.
Answer: B – aerobic metabolism of fatty acids
Question: During activities requiring aerobic endurance
Answer Choices: oxygen is not required.
glycogen and glycolysis are the primary sources of reserve energy.
oxygen debts are common.
most of the muscle’s energy is produced in mitochondria.
fatigue occurs in a few minutes.
Answer: D – most of the muscle’s energy is produced in mitochondria
Question: Because skeletal muscle contractions demand large quantities of ATP, skeletal muscles have
Answer Choices: abundant mitochondria and a poor blood supply.
many mitochondria and a rich blood supply.
adipose tissue between fibers to supply nutrients for ATP production.
a rich blood supply and few mitochondria.
a rich nerve supply.
Answer: B – many mitochondria and a rich blood supply
Question: The muscle tissue that shows no striations is ____ muscle.
Answer Choices: multinucleated
cardiac
voluntary
skeletal
smooth
Answer: E – smooth
Question: The following is a list of the events that occur during a muscle contraction.
Myosin cross-bridges bind to the actin.
The free myosin head splits ATP.
Calcium ion is released from the sarcoplasmic reticulum.
The myosin head pivots toward the center of the sarcomere.
Calcium ion binds to troponin.
The myosin head binds an ATP molecule and detaches from the actin.
The correct sequence of these events is
Answer Choices: 1, 3, 5, 4, 6, 2
3, 5, 1, 2, 4, 6
1, 4, 6, 2, 3, 5
3, 5, 1, 4, 6, 2
5, 1, 4, 6, 2, 3
Answer: D – 3, 5, 1, 4, 6, 2
Question: Which of the following is a recognized function of skeletal muscle?
Answer Choices: maintain posture
produce movement
guard body entrances and exits
maintain body temperature
All of the answers are correct.
Answer: E – All of the answers are correct
Question: The neuroglial cells that participate in maintaining the blood-brain barrier are the
Answer Choices: microglia.
astrocytes.
oligodendrocytes.
Schwann cells.
ependymal cells.
Answer: B – astrocytes
Question: Which of these would lead to increased oxygen consumption?
Answer Choices: increased heat production
increased muscle activity
increased aerobic respiration by muscle cells
increased conversion of lactic acid to glucose
All of the answers are correct.
Answer: E – All of the answers are correct