Nokea
Which of the following is not in the inner ear
- A. Eustachian tube
- B. Cochlea
- C. Sacculus
- D. Semicircular canals
Correct Answer: A
Rationale: The Eustachian tube is part of the middle ear, not the inner ear.
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Blood platelets assist in arresting bleeding by
- A. Releasing factors promoting blood clotting.
- B. Adhering together to form plugs when exposed to collagen.
- C. Liberating high concentrations of calcium.
- D. Releasing factors causing vasoconstriction.
Correct Answer: B
Rationale: Platelets aggregate at injury sites, adhering to collagen to form plugs, and release clotting factors and vasoconstrictors like serotonin.
Dehydration synthesis:
- A. requires water
- B. results in the splitting of molecules
- C. is the means of forming disaccharides
- D. occurs when glycogen stores are used by tissue cells
Correct Answer: C
Rationale: Dehydration synthesis removes water to bond monomers (e.g., forming disaccharides like sucrose).
The cell membranes in skeletal muscle
- A. Are impermeable to fat-soluble substances.
- B. Are more permeable to sodium than to potassium ions.
- C. Become more permeable to glucose in the presence of insulin.
- D. Become less permeable to potassium in the presence of insulin.
Correct Answer: C
Rationale: Insulin increases glucose uptake by facilitating transporter movement to the muscle cell membrane.
The basic shapes of epithelial cells include all but which of the following?
- A. stratified
- B. squamous
- C. cuboidal
- D. columnar
Correct Answer: A
Rationale: Stratified refers to layers, not a shape.
A patient with partly compensated respiratory acidosis
- A. Must have a raised PCO2
- B. May have a reduced hydrogen ion concentration\left[\mathrm{H}^{+}\right]$.
- C. Must have a raised bicarbonate concentration\left[\mathrm{HCO}_3{ }^{-}\right]$.
- D. May have evidence of renal compensation.
Correct Answer: A
Rationale: Respiratory acidosis is defined by high PCO2; kidneys compensate by raising HCO3-.