Mr. Smith moved from a low altitude to a high altitude and experienced an increase in RBCs. Which of the following caused this increase?
A. The increased metabolic rate seen at higher altitudes
B. Increased exercise
C. The lower temperature present at higher altitudes
D. The increased CO2 retention that occurs at high altitudes
E. The lower O2 concentration seen at higher altitudes
Answer: E
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When the testes are exposed to cool temperatures,
A. the scrotal septum opens, allowing the testes to share warmth. B. the dartos and cremaster muscles contract to bring the testes closer to the body. C. testosterone production stops. D. there is an increase in sperm production. E. None of the choices is correct; the testes are not affected by temperature.
The superior vena cava is formed by the merging of the ________ veins.
A. internal thoracic B. inferior epigastric C. lumbar D. internal jugular E. brachiocephalic
Canaliculi are
A) also known as Volkmann's channels. B) the same as Haversian canals. C) narrow passageways in the matrix connecting lacunae to blood supply. D) layers of bony matrix laid down in rings. E) have both a fibrous outer layer and a cellular inner layer.
Blood leaving the aorta enters which of the following vessels leading to the left forearm?
A) Left subclavian artery B) Descending aorta C) Left common carotid artery D) Right subclavian artery