In the autorhythmic SA node cells, the opening of the calcium channels allow
a) the further depolarization of these pacemaker cells
b) the further repolarization of these pacemaker cells
c) ventricular relaxation
d) cardiac tamponade
e) none of the above
Answer: a) the further depolarization of these pacemaker cells
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A) pacemaker potential. B) action potential. C) vagal tone. D) sinus rhythm. E) SA potential.
In animals, the first line of defense against pathogens is the ______________
Fill in the blank with the correct word.
Chemistry is important to the study of physiology because
A) all of the above. B) chemical reactions enable our bodies to extract energy from nutrients. C) the foods that we eat are chemicals. D) body functions depend on cellular functions that reflect chemical changes.
Which portion of the ear contains the sensory receptors for hearing and balance?
A. Auditory tube B. Inner ear C. Tympanic membrane D. External ear E. Middle ear