Pulmonary (external) respiration refers to
A. gas exchange in the atmosphere.
B. gas exchange between the lungs and the blood.
C. gas exchange between the blood and body tissues.
D. cellular respiration.
E. atmospheric air coming into the lungs.
Answer: B
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A cell that contains 23 pairs of chromosomes is
A. polyploid. B. diploid. C. haploid. D. monoid.
If a person wearing a head, neck, and upper chest shield is subjected to a high dose of radiation, one of the resultant health problems might be damage to bone marrow in exposed body regions. If the bone marrow damage occurred in an adult, which cell types might initially no longer be produced in sufficient numbers for the proper immune response to be sustained?
A) B cells B) NK cells C) all lymphocytes D) T cells E) B cells and NK cells
The transparent portion of the fibrous tunic is the
-pupil. -conjunctiva. -iris. -cornea. -canthus.
What is the function of the arrector pili?
A. Secrete sebum B. Monitor body temperatures C. Make hairs stand up D. Detect tactile stimuli