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Bio 1720 Exam2 - Name Signature BIOL 1720 Summer 2001 Exam...

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Name:________________________________ SS#:_________________________ Signature:_____________________________ BIOL 1720 Summer 2001 Exam II 1. Blood circulating in a fish that has just left the gills: a. flows back to the atrium. b. returns to the sinus venosus and then out to systemic capillary beds. c. flows to the cornus arteriosus. d. flows through vessels directly to systemic capillary beds. 2. The rising phase of an action potential is initiated when the: a. sodium channels open. b. potassium channels open. c. calcium channels open. d. sodium channels close. e. sodium and potassium channels both open. 3. Cutaneous respiration is common and important in: a. amphibians. b. reptiles except crocodiles. c. crocodiles. d. mammals. e. birds. 4. Gray matter in nervous tissue consists of: 5. The human heart beat originates from the 6. During the cardiac cycle, the period during which the ventricles contract is called:
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7. The simplest reflexes, such as the knee jerk reflex, involve: a. only one neuron. b. two neurons. c. three neurons, including an interneuron. d. four neurons, including two sensory neurons and an interneuron. e. only one receptor cell and a neuron. 8. The major characteristics of the mammalian nervous system are first seen in (from an evolutionary standpoint) in: 9. Blood pressure sensors (baroreceptors) are found: 10. The hormone which causes blood vessels to relax/dilate is:
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