PhysioEx 6
explain the effect that decreasing the temperature had on the frog heart. how do you think the human heart would respond?
as temperature decreased, the heart rate decreased. a human heart would stay the same.
explain the effect that increasing the temperature had on the frog heart. how do you think the human heart would respond
as the temperature increased so did heart rate. a human heart rate would stay the same way
describe the effect that increasing the calcium ions had on the heart
calcium ions increase heart rate
explain the effect that extreme vagus nerve stimulation has on the heart
it caused the heart rate to drop substantially
describe the effect that pilocarpine had on the heart and why it had this effect
it decreased the heart rate because it enhanced the effects of acetylcholine
atropine is an acetylcholine antagonist. does atropine inhibit or enhance the effects of acetylcholine?
it inhibits acetylcholine effects and atropine increased heart rate
describe the effect that increasing the potassium ions initially had on the heart in this activity
it slowed the heart rate
what do you think would happen to the heart rate if the vagus nerve was cute
the heart rate would increase
describe how the sympathetic and parasympathetic nervous systems work together to regulate heart rate
they both send nerve impulses, sympathetic increases heart rate and parasympathetic decreases
describe how calcium channel blockers are used to treat patients and why
they lower blood pressure by inhibiting calcium from entering the heart
describe why Ringer's solution is required to maintain heart contractions
because it contains essential electrolytes that keep the heart viable
two ways that the heart can overcome excessive vagal stimulation
by sympathetic reflexes or purkinje fibers will help slow the heart rate
distinguish between cholingeric and adrenergic chemical modifiers
cholinergic modifies and enhances acetylcholine effect an example is pilocarpine adrenergic modifies and enhances epinephrine, an example is atropine
describe benefits of administering digitalis
heart rate slowed while contraction force is increased
