Heart beat decreases in the following conditi | vedclass

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(D) The heart rate is regulated by various physiological and chemical factors.$1$. Acidosis (low $pH$) and alkalosis (high $pH$) can disrupt cardiac f

Vedclass · Accepted Answer

increase in level of hormone epinephrine

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(D) The heart rate is regulated by various physiological and chemical factors.$1$. Acidosis (low $pH$) and alkalosis (high $pH$) can disrupt cardiac function and generally decrease heart rate.$2$. Hypoxia (low oxygen levels) initially may cause tachycardia but prolonged hypoxia leads to a decrease in heart rate.$3$. Elevated levels of $K^{+}$ (hyperkalemia) decrease the resting membrane potential,leading to a decrease in heart rate,while high $Na^{+}$ levels can also interfere with cardiac conduction.$4$. Epinephrine (adrenaline) is a hormone that stimulates the sympathetic nervous system,which increases both the heart rate and the force of contraction. Therefore,an increase in epinephrine levels causes an increase,not a decrease,in heart rate.

Heart beat decreases in the following conditions $EXCEPT$ . . . . . . .

Similar Questions

Which of the following factors increase the heart rate?
$(A)$ Sympathetic nerve signals
$(B)$ Parasympathetic nerve signals
$(C)$ Adrenal medullary hormones
$(D)$ Vagus nerve
$(E)$ Thyroxine hormone
$(F)$ Acetylcholine

When a normal man's heart is injected with a physiological concentration of adrenaline,it causes:

If the sympathetic nerve to the heart is cut off,the heart beat will

Assertion $(A) :-$ Parasympathetic neural signals decrease the cardiac output.
Reason $(R) :-$ Parasympathetic neural signals decrease the rate of heartbeat and the speed of conduction of action potentials.

During high blood pressure,the regulation of circulation and heart rate is controlled by which of the following centers?

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