The autonomic nervous system is divided into which two branches?
A. Somatic, autonomic
B. Sympathetic, parasympathetic
C. Motor, sensory
D. Input, output
Answer: B
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Which gland produces most of the semen?
A. The prostate gland B. The bulbourethral gland C. The vestibular gland D. The seminal vesicle E. The areolar gland
Assuming you have normal respiratory function at sea level, start holding your breath. Which of the following could be true in 60 seconds?
A. The oxygen-hemoglobin dissociation curve is shifting to the left B. Venous PO2 = 50 mmHg C. Arterial PCO2 = 50 mmHg D. Alveolar PO2 = 105 mmHg
During oxidative phosphorylation, hydrogen atoms are passed serially from a coenzyme down a chain of molecules called cytochromes
Indicate whether the statement is true or false.
Which of the following statements about positive and negative lymphocyte selection is TRUE?
A. In both instances, lymphocytes die after they do their job. B. In both instances, antigens do not recognize pathogens in the body. C. Only positive selection is needed for proper functioning of the immune system. D. It is necessary to have lymphocytes that can fight invaders without harming the body's own tissues.