The pH of blood is regulated so that it is
A. exactly 7.0.
B. 6.65-6.75.
C. 7.35-7.45.
Answer: C
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The opening and closing of the heart valves is caused by
A. contraction and relaxation of papillary muscles that pull on heart strings. B. pressure changes of alternating contraction and relaxation during the cardiac cycle. C. contraction of the smooth muscle in the walls of the great vessels leaving the heart. D. action potentials within the cusps of the valves.
The human genome consists of approximately 3.2 billion base pairs. Protein-coding genes represent ________ of the total genome.
A) 25 B) 10 C) 2 D) 50 E) 99
Which of these areas is located in the postcentral gyrus of the cerebral cortex?
A) olfactory cortex B) visual cortex C) primary motor cortex D) primary somatic sensory cortex E) primary auditory cortex
which muscle flexes, adducts and medially rotates the humerus?
a) pectoralis major b) trapezius c) brachialis d) pectoralis minor