Schwann's cells begin to form myelin sheaths around axons in the peripheral nervous system
a) when neurons are injured.
b) during fetal development.
c) after birth.
d) only in response to electrical stimulation by neuroglial cells.
e) during the early onset of Alzheimer's disease.
b
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A diet rich in sodium and vitamins helps to maintain good bone growth and development
Indicate whether the statement is true or false.
Which hormone is stimulated by high levels of dietary fat in the small intestine?
a) Pepsin b) Secretin c) Gastrin d) Cholecystokinin e) Amylase
Select the correct statement about proteins
A) Proteins will be used by most cells for ATP synthesis if insufficient carbohydrates are ingested. B) All proteins can be synthesized in the body if most of the amino acids are present. C) Strict vegetarians need not worry about adequate protein intake, as most vegetables are almost perfect sources of amino acids. D) Catabolic steroids (hormones) accelerate the rate of protein synthesis.
What is the primary form in which CO2 is transported in the blood?
a. physically dissolved b. bound to hemoglobin c. bound to plasma protein d. as bicarbonate e. as carbonic anhydrase