When the normal heart of a man is injected wi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Adrenaline is a hormone secreted by the adrenal medulla that acts as a neurotransmitter and hormone to prepare the body for 'fight or flight' resp

Vedclass · Accepted Answer

First increased then normal rate

Vedclass · Answer

(D) Adrenaline is a hormone secreted by the adrenal medulla that acts as a neurotransmitter and hormone to prepare the body for 'fight or flight' responses. When a physiological concentration of adrenaline is injected into a normal human heart, it binds to $\beta_1$-adrenergic receptors on the cardiac muscle. This stimulation leads to an increase in the heart rate (positive chronotropic effect) and force of contraction. As the adrenaline is metabolized and its concentration in the blood decreases, the heart rate gradually returns to its normal resting state.

When the normal heart of a man is injected with a physiological concentration of adrenaline, it shows:

Similar Questions

Heart rate is increased by all the following except:

Neural signals through ............ can increase the rate of heart beat,the strength of ventricular contraction and thereby the cardiac output.

Cardiac activities of the heart are regulated by:
$A.$ Nodal tissue
$B.$ $A$ special neural centre in the medulla oblongata
$C.$ Adrenal medullary hormones
$D.$ Adrenal cortical hormones
Choose the correct answer from the options given below:

What is the effect on the heart rate if the parasympathetic nerve is cut in a rabbit?

Stimulation of the vagus nerve will make the heart beat

Vedclass Test Series

Exam Paper Generator

Online Exam Module