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SCN1111 Practice Exam Questions And Accurate Answers
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SCN1111 Practice Exam Questions AndAccurate Answers
Which one of the following statements correctly 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 delivered by the blood supply to the nearby 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 one?
a.ATP must be present
b.Cross-bridges must form between actin and myosin
c.Troponin-tropomyosin complex must shift out of the way
d.The troponin and tropomysin must slide relative to each other, shortening the
sarcomere - Answer d. The troponin and tropomysin must slide relative to each other,
shortening the sarcomere
Once a muscle cell has depleted its small supply of ready-made ATP, what will it use
next for energy?
a.Phospholipids
b.Glycogen
c.Creatine phosphate
d.Proteins - Answer c.Creatine phosphate
The primary energy source used by muscle cells to generate ATP is:
a.steroids
, b.glucose
c.fatty acids
d.glycogen - Answer b.glucose
When an electrical impulse traveling along a motor neuron arrives at a neuromuscular
junction:
a.a new electrical impulse is generated that returns the message to the original nerve
b.calcium is transported back to the sarcoplasmic reticulum
c.there is an increase in the secretion of acetylcholine at the neuromuscular junction
d.sliding of actin and myosin filaments is inhibited - Answer c.there is an increase in the
secretion of acetylcholine at the neuromuscular junction
All of the following are functions of bone EXCEPT which one?
a.serving as an endocrine organ, secreting several different hormones
b.red blood cell formation
c.mineral storage
d.attachment of muscles, enabling movement - Answer a.serving as an endocrine
organ, secreting several different hormones
Which one of the following statements CORRECTLY describes the location of compact
bone and spongy bone?
a.Compact bone covers the ends of the bone and forms the shaft, and spongy bone is
inside the ends, under the compact bone
b.Spongy bone is found throughout the shaft and ends, covered by a thin layer of
compact bone
c.The ends of long bones are solid compact bone, and the shaft is predominantly spongy
bone
d. Spongy bone is found on the outside of the shaft, and compact bone forms the hard
core of the shaft - Answer a.Compact bone covers the ends of the bone and forms the
shaft, and spongy bone is inside the ends, under the compact bone
A typical long bone has an epiphysis at each end, which can be thought of as:
a.yellow bone marrow
b.an enlarged knob
c.a site of water storage
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