Study the following hormones.
a) Melatonin
b) Cortisol
c) Thyroxine
d) Testosterone
Which of the above hormones influence metabolism?

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Only b and c

Only c and d

Only a and b

a, b, c and d

answer is D.

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Detailed Solution

All the hormones mentioned - melatonin, cortisol, thyroxine, and testosterone influence metabolism.

Thyroxine is a thyroid hormone that plays a central role in regulating the body's metabolic rate. It affects almost every cell in the body, influencing energy production, growth, and development. Thyroxine helps regulate the basal metabolic rate, which is the rate at which the body uses energy at rest.
Cortisol is a steroid hormone produced by the adrenal glands. It plays a significant role in metabolism by regulating glucose levels in the body. Cortisol helps to mobilize glucose from various sources, such as the liver, muscles, and adipose tissue, making it available for energy production. It also influences protein and fat metabolism.
Melatonin regulates sleep-wake cycles and has effects on circadian rhythms.
Testosterone is a male sex hormone with functions related to sexual development, muscle mass, and bone density.

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