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