When oxytocin is released again from posterior pituitary gland in response to sm

Question

When oxytocin is released again from posterior pituitary gland in response to smooth muscle contraction in the uterus, this is: A) negative feedback B) positive feedback C) double negative feedback D) neurohormonal reregulation E) neurosecretory feedback Muscle mass is increased by testosterone. Where are testosterone receptors located? A) Cell membrane B) Testes C) Nucleus D) Cytoplasm E) Vas deferens Which is a cost of being an endotherm? A) Limited activity B) High energy costs C) Limited to single cell organisms D) All of the above

Explanation / Answer

1. When oxytocin is released again from posterior pituitary gland in response to smooth muscle contraction in the uterus, this is positive feedback.

A positive feedback increases the physiological process. The more the hormone is released, and the more it induces contraction in uterus, the pituitary continues to secrete it.

Correct option is b.

2. Testosterone hormone also known as androgen is said to increase muscle mass in males. The androgen receptors are nuckear receptors which are pre dominantly found in cytoplasm. They get activated upon binding with testosterone and translocate to nucleus. This hormone controls gene expression so they are needed to be carried to the nucleus from cytoplasm.

Correct option is d.

3. An endotherm is an organism which has a constant internal body temperature. To maintain this constant body temperature, a lot of energy is utilised to generate heat. So the cost of being an endotherm is High energy costs.

Correct option us b.

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