Membrane potential is related to the uneven distribution of what two positively charged ions?
a. salt and sugar
b. calcium and magnesium
c. hydrogen and oxygen
d. sodium and potassium
e. chloride and phosphorus
d
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Myelinated axons conduct impulses much faster because
a. the myelin insulates the axon. b. channels only have to open at the nodes. c. voltage is not lost through along myelinated areas. d. of saltatory conduction. e. all of these answers.
The nasopharynx transitions into the oropharynx at the level of the
A) hard palate. B) soft palate. C) cribriform plate. D) internal nares. E) pharyngeal septum.
Why doesn't semen enter the urinary bladder during ejaculation?
A) The smooth muscle sphincter at the base of the urinary bladder closes. B) There is no urge to urinate during sexual intercourse because of the suppression of LH by testosterone buildup in the blood. C) Ejaculation is a parasympathetic reflex resulting in no response by urinary contraction muscles. D) There is no common duct between the reproductive system and the urinary system.
Polycythemia is a condition characterized by the excessive production of ________.
A. leukocytes B. platelets C. erythrocytes D. All of the choices are correct.