PhysioEx 6

Explain the effect that increasing the temperature had on the frog heart?

As temp increased so did heart rate

Explain the effect that decreasing the temperature had on the frog heart?

As temperature decreased so did the heart rate

Describe the effect pilocarpine had on the heart and why it had this effect

Pilocarpine decreased heart rate bc it enhanced acetylcholine effect.

How calcium channel blockers are used to treat patients?

lower Blood pressure by inhibiting calcium from entering heart

Describe the effect that increasing the potassium ions initially had on the heart in this activity.

potassium ions slowed heart rate

Explain two ways that the heart can overcome excessive vagal stimulation?

sympathetic reflexes or purkinjie fibers

Describe the effect that increasing Calcium ions had on the heart

Calcium elevated heart rate

Distinguish between cholinergic and adrenergic chemical modifier.

Cholinergic modifiers inhibit, mimic, or enhance Ach. Adrenergic modifiers inhibit, mimic, or enhance epi

What do you think would happen to the heart rate if the vagus nerve was cut?

Heart rate would increase

Atropine is an acetylcholine antagonist. Does it inhibit or enhance the effects of ACh?

Inhibits. ACh decreases heart rate but when atropine was used heart rate increases.

Explain effect that extreme vagus nerve stimulation had on the heart. How well did the results compare with your prediction?

The heart rate decreased.

Describe why Ringers solution is required to maintain heart contraction

The solution of Cl, Na, K, Ca, and Mg creates an isotonic solution that can keep the heart beating.

Describe how sympathetic and parasympathetic nervous systems work together to regulate heart rate.

They both send the heart nerve impulses. Though the parasympathetic system does not directly change the force of contraction when decreasing heart rate. The sympathetic system increases heart rate.

Benefits of administering digitalis

heart rate slowed while contraction froce is increased