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Question

Hormonal regulation of cardiac activity involves the hormones  ___ and ____ secreted by the ____.


A
Epinephrine, norepinephrine, cortex of adrenal glands
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B
Epinephrine, norepinephrine, medulla of adrenal glands
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C
Thyroxine, calcitonin, thyroid gland
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D
Aldosterone, corticosterone, cortex of adrenal glands
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Solution

The correct option is B Epinephrine, norepinephrine, medulla of adrenal glands

The renal medulla secretes two similar hormones: adrenaline( epinephrine) and noradrenaline( norepinephrine) that have almost the same basic effect.

Role of epinephrine and norepinephrine- They whip up metabolism for preparing the animal to face special conditions created by physical stress such as fall in BP or blood sugar, anger, fear etc..All these conditions require more energy which is provided by increasing heart rate, blood pressure, sugar level of blood.

So, the correct answer is 'Epinephrine, norepinephrine, medulla of adrenal glands'.


Biology

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