How Adrenaline and Acetylcholine Affect Heart Rate

How Adrenaline and Acetylcholine Affect Heart Rate

Assessment

Interactive Video

Biology, Chemistry, Health Sciences

University

Hard

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In this episode, Leslie Samuel discusses how adrenaline and acetylcholine affect heart rate. Adrenaline, released from the adrenal gland, increases heart rate by enhancing sodium and calcium conductance, leading to faster action potentials. Conversely, acetylcholine increases potassium conductance, causing hyperpolarization and slower depolarization, which decreases heart rate. The episode also recaps the pacemaker potential and spontaneous signals in the heart, and concludes with a mention of additional resources available on the Interactive Biology website.

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5 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of the SA node in the heart?

To store oxygen

To pump blood throughout the body

To generate spontaneous signals for heartbeats

To filter blood

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does adrenaline affect the conductance in pacemaker cells?

It increases conductance for sodium and calcium ions

It decreases conductance for sodium and calcium ions

It decreases conductance for potassium ions

It increases conductance for potassium ions

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the heart rate when adrenaline is released?

The heart rate remains unchanged

The heart rate decreases

The heart stops

The heart rate increases

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What effect does acetylcholine have on potassium conductance?

It increases sodium conductance

It has no effect on potassium conductance

It increases potassium conductance

It decreases potassium conductance

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does acetylcholine affect the depolarization process?

It slows down depolarization

It has no effect on depolarization

It stops depolarization

It speeds up depolarization