The foramen ovale is actually an opening in the
A. interatrial septum.
B. fossa ovalis.
C. aorticopulmonary septum.
D. interventricular septum.
E. tetralogy of Fallot.
Answer: A
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The absolute refractory period of an excitable membrane roughly corresponds to the period when sodium channels are opening and inactivated
Indicate whether the statement is true or false.
The function of the coronary sinus is to
A. connect the top and bottom halves of the heart. B. guide the inferior vena cava into the right atrium. C. shunt blood from the right atrium to the left atrium. D. take blood from the coronary circulation to the right atrium. E. guide the aorta out of the heart.
Which of the following is true regarding the blood-testis barrier?
A. It maintains testis temperature at 35°C. B. It prevents heat loss from the testes. C. It prevents antibodies in the blood from getting to the reproductive cells. D. It prevents blood from getting to the testes. E. It maintains testis temperature at 37°C.
The function of neurofibril nodes is to
A. inhibit the transmission of a nerve impulse. B. produce a slower impulse through continuous conduction. C. produce a faster nerve impulse through salutatory conduction. D. protect the delicate axon sheath. E. provide points of attachment for nerve threads.