BMSC 207 MIDTERM 2 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

BMSC 207 MIDTERM 2 UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS

Question:
1. Sensory information would enter into the spinal cord through the:
Answer:
Dorsal Root

Question:
2. In some instances the spinal cord can act as the integrating center to initiate a response to a stimulus
without receiving input from the brain.
Answer:
True

Question:
3. Which region of the brainstem contains the cardiovascular and respiratory control centers?
Answer:
Medulla

Question:
4. Which of the following regions regulates posture and balance?
Answer:
Cerebellum

Question:
5. This area of the cerebrum is important in initiating and terminating voluntary movement
Answer:
The Basal Ganglia

Question:
6. Which of the following is NOT a lobe of the cerebral cortex?
1. Frontal lobe
2. Partial lobe
3. Temporal lobe
4. Gustatory lobe
5. Temporal lobe
Answer:
Gustatory Lobe

Question:
7. A receptor potential is:
Answer:
The muscle physiology term of a graded potential

,Question:
8. Tonic receptors
Answer:
Slowly decrease the frequency of action potentials generated to a constant stimulus

Question:
9. The division of the autonomic nervous system that prepares the body for intense levels of activity and
stress is the
Answer:
Sympathetic division

Question:
10. The presence of two peripheral efferent neurons in a pathway is typical of the (blank) division of the
nervous system.
Answer:
Autonomic division

Question:
11. The adrenal medulla is important to the sympathetic branch of the autonomic nervous system because
(3 points)
Answer:
- It is a source of Catecholamines
- It is considered a modified sympathetic ganglions
- It releases epinephrine directly into the blood stream

Question:
12. Which type of muscle(s) is/are uninucleate?
Answer:
Cardiac muscle and Smooth muscle

Question:
13. This skeletal muscle term refers to a muscle that moves bones closer together.
Answer:
Flexor muscle

Question:
14. Which of the following proteins is NOT part of the thin filaments?
1. Tropomyosin
2. Troponin
3. Actin
4. Myosin
Answer:
Myosin

Question:
15. What protein is a part of the thick filaments?

,Answer:
Myosin

Question:
16. This calcium storage organelle plays an important role in muscle contraction:
Answer:
Sarcoplasmic Reticulum (SR)

Question:
17. Put these events in the correct chronological sequence:
1. End-plate potentials trigger action potentials.
2. Transverse tubules convey potentials into the interior of the cell.
3. Acetylcholine binds to receptors on the motor end plate.
4. Ca2+ is released from the sarcoplasmic reticulum.
Answer:
3 ----> 1 -----> 2 ----> 4

Question:
18. This protein acts as a voltage sensor in the t-tubules of skeletal muscle fibres
Answer:
DHP receptors

Question:
19. A single muscle fibre is innervated by multiple alpha motor neurons? True or False?
Answer:
FALSE! A single muscle fiber is innervated by one motor neuron but one alpha motor neuron can
innervate multiple muscle fibers.

Question:
20. The motor end plate is
Answer:
a folded area of muscle cell membrane containing nicotinic ACh receptors

Question:
21. The local depolarization of the sarcolemma caused by opening of nicotinic ACh receptors is most
commonly referred to as
Answer:
An Excitatory Endplate Receptor (EEP)

Question:
22. ATP production requiring the presence of mitochondria and oxygen is referred to as
Answer:
Aerobic (oxidative) metabolism

Question:
23. ATP production that turns glucose into ATP and does not require oxygen or mitochondria is referred to
as

, Answer:
Glycolysis (anaerobic metabolism)

Question:
24. Which of the following mechanisms of skeletal muscle fatigue is LEAST likely to occur?
A. Reduced ACh release from alpha motor neurons
B. Reduced Ca2+ reuptake by the SR
C. Reduced Ca2+ release by the SR
D. Inhibition of Ca2+ binding to troponin C
Answer:
Reduced ACh release from alpha motor neurons is least likely to occur because it is an efficient process.

Question:
25. This type of skeletal muscle fibre would be the largest in diameter, have a pale white colour and
contain very few mitochondria
Answer:
Fast-glycolytic muscle muscle fibers (Type 2X)

Question:
26. Which contraction would develop the greatest amount of tension
Answer:
Fused tetanus contraction

Question:
27. Motor units that control skeletal muscles involved with fine motor movements (eg. eye muscles)
contain (BLANK) muscle fibers than motor units that control more gross powerful movements.
A. More
B. Fewer
C. The same number of
Answer:
Fewer

Question:
28. The two types of skeletal contractions
Answer:
Isometric and Isotonic contractions

Question:
29. What is Isotonic contraction?
Answer:
Skeletal muscle contraction that generates force to generate movement

Question:
30. What is Isometric contraction?
Answer:
Skeletal muscle contraction that generates force but generates NO movement