Capillary structure is uniquely adapted for exchange processes because
A. they allow two-way flow.
B. they contain many desmosomes and tight junctions.
C. they have only one layer of simple squamous epithelium (endothelium).
D. they have valves to control flow.
Answer: C
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In what way(s) are the muscle arrangements in the body wall of earthworms similar to those of the human digestive tract?
A) Both exhibit peristaltic waves of contractions. B) Both are organized into layers of circular and transverse muscles C) Both consist of striated muscle. D) All of the above
Treatment of infertility with HCG and gonadotropins can sometimes result in multiple pregnancies.
a. true b. false
Describe red pulp and white pulp found in the spleen
A) Red pulp contains large numbers of red blood cells; white pulp resembles lymphoid nodules and contains lymphocytes. B) Red pulp resembles lymphoid nodules and contains lymphocytes; white pulp contains large numbers of red blood cells. C) Red pulp contains large amounts of red bone marrow; white pulp contains large amounts of yellow bone marrow. D) Red pulp is where red blood cells are stored; white pulp is the primary storage site for triglycerides and other lipids. E) Red pulp is where hemoglobin is produced and stored in the body; white pulp is where T and B lymphocytes are produced and stored in the body.
Which is correctly paired?
a. Arrhythmia: AV node failure b. Fibrillation: premature contraction c. Heart block: uncoordinated atrial and ventricular contraction d. Ectopic focus: an abnormal pacemaker