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SCN1111 Practice Exam Questions And 100% Correct Answers (A+ Graded)
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SCN1111 Practice Exam Questions And 100%Correct Answers (A+ Graded)
Which of the following statements describes activities of muscles?
a. All muscles are attached to bones
b. All muscles shorten when they contract
c. All muscles are under conscious control
d. All muscles are synergistic -
Answer b. All muscles shorten when they contract
Contraction of a skeletal muscle cell is initiated by the:
a. release of sodium ions by the neuron into the neuromuscular junction
b. release of acetylcholine by a neuron terminating at the neuromuscular junction
c. hormones released by the blood supply to the surrounding tissue
d. release of calcium ions by the neuron into the neuromuscular junction - Answer b.
release of acetylcholine by a neuron terminating at the neuromuscular junction
All of the following are necessary for contraction to occur EXCEPT which of the
following?
a. ATP must be available
b. Cross-bridges must be formed between actin and myosin
c. Troponin-tropomyosin complex must move out of the way
d. The troponin and tropomysin must slide relative to each other, shortening the
sarcomere
After a muscle cell has used up its small store of premade ATP, what will be the next
source of energy?
, a. Phospholipids
b. Glycogen
c. Creatine phosphate
d. Proteins Answer c. Creatine phosphate
Muscle cells predominantly rely on what to ultimately produce ATP?
a. steroids
b. glucose
c. fatty acids
d. glycogen Answer b. glucose
When the electrical impulse traveling along a motor neuron reaches the neuromuscular
junction: a. a new electrical impulse is fired that sends the message back to the
originating nerve b. calcium is pumped back into the sarcoplasmic reticulum c. there is
an increase in the release of acetylcholine at the neuromuscular junction d. sliding of
actin and myosin filaments is blocked Answer c. there is an increase in the release of
acetylcholine at the neuromuscular junction
Which of the following are functions of bone EXCEPT which one?
a. acts as an endocrine organ that secretes several different hormones
b. red blood cell formation
c. mineral storage
d. site for muscle attachment, enabling mobility a. acts as an endocrine organ that
secretes several different hormones
Which of the following statements CORRECTLY describes the location of compact bone
and spongy bone?
a. Compact bone on the ends of the bone and also forms the shaft, and inside the ends
spongy bone is found under the compact bone b. Spongy bone throughout the shaft and
ends, covered by a thin layer of compact bone c. Long bones ends are solid compact
bone and the shaft is mainly spongy bone
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