In clonal selection of B cells, which substance is responsible for determining which cells will eventually become cloned?
A) antigen
B) interferon
C) antibody
D) complement
A) antigen
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Which type of epithelial tissue is found lining the heart, blood vessels and lymphatic vessels?
a) Simple squamous epithelium b) Simple cuboidal epithelium c) Stratified squamous epithelium d) Stratified cuboidal epithelium e) Simple columnar epithelium
Fat-soluble vitamin overdoses primarily affect which organ?
A) heart B) brain C) skeletal muscles D) liver E) lungs
Which of the following is the most abundant mineral in the body?
a) Na+ b) Calcium c) Magnesium d) Phosphate e) Iron
Sympathetic stimulation of the heart
a. increases the heart rate. b. increases the contractile strength of the heart muscle. c. shifts the Frank-Starling curve to the left. d. two of these answers. e. all of these answers.