In a classic experiment, Otto Loewi electrically stimulated the vagus nerve of a frog heart. He then took the fluid bathing the stimulated heart and applied it to a second frog heart. The beating rate of both hearts slowed down with this treatment. Based on this response, you can assume the nerve he stimulated was part of the
A. parasympathetic system.
B. sympathetic system.
C. somatic system.
D. atrioventricular system.
E. central nervous system.
A. parasympathetic system.
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You are out at night and hear a sound in the bushes. The electrical signal carrying this information to your brain is carried first by a
A. sensory neuron. B. motor neuron. C. interneuron. D. glial cell. E. All of these choices are correct.
S. pneumoniae can be described as:
a. resistant to bile and optochin. b. hemolytic on sheep blood agar c. CAMP positive d. often carrying an antiphagocytic capsule.
Blood pressure is normally measured in the ____
a. aorta b. carotid artery c. superior vena cava d. brachial artery e. cephalic vein
Which of these tissues is between the epidermis and a vascular bundle in a young dicot stem?
A) Cortex B) Xylem C) Pith D) Phloem E) Cork