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Hormonal Communication Overview

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Questions and Answers

What is the main physiological change triggered by adrenaline in response to a threat?

Enhanced digestive system function

Increased heart rate and stroke volume (correct)

Pupil constriction

Decreased blood flow to the brain

Which of the following is NOT a role of adrenaline's interaction with adrenergic receptors?

Interacting with a kinase enzyme

Triggering a specific series of events

Activating adenyl cyclase

Stimulating the digestive system (correct)

What enzyme is activated by cyclic AMP in response to the binding of adrenaline to adrenergic receptors?

Kinase enzyme (correct)

Adenyl cyclase

ATP

Enzymes required for a particular response

Which region of the heart is known as the pacemaker?

Sinoatrial node Signup and view all the answers

What does adrenaline act as in the cellular signaling process?

First messenger Signup and view all the answers

What physiological change does adrenaline cause in the pupil?

Dilation Signup and view all the answers

Which enzyme converts ATP to cyclic AMP in response to adrenaline binding?

Adenyl cyclase Signup and view all the answers

What role does cyclic AMP play in the cellular signaling pathway initiated by adrenaline?

Activating a kinase enzyme Signup and view all the answers

What is the function of the membrane-associated enzyme adenyl cyclase in response to adrenaline binding?

Convert ATP to cyclic AMP Signup and view all the answers

What happens in response to the wave of electrical stimulation caused by the sinoatrial node in the heart?

Atria contract roughly simultaneously Signup and view all the answers