1) Which of the following Processes are controlled by positive feedback? a. Cont

Question

1) Which of the following Processes are controlled by positive feedback?

a. Contractions during labor

b. Blood clotting

c. Ovulation

c. All of the above

2) Which of these is a function of the circulatory system?

a. Transportation

b. Regulation

c. Production

e. All of the above

3) If the scientists discovered a new hormone is the human body the only thing they know about it was that it is secreted from the hypothalamus, what would its most probable target tissue be? (Use what you know about well-researched hormones)

              a. Anterior pituitary

              b. Posterior pituitary

              c. Ovaries or tests

              d. Adrenal glands

              c. Thyroid gland

4) What is the target tissue of TRH?

a. hypothalamus

b. anterior pituitary

c. thyroid gland

d. ovaries

e. none of the above

Explanation / Answer

1. The last option that is "All of the above" is correct. Here all the process are controlled by positive feedback. A positive feedback represents a self-amplifying cycle where a physiological change leads to even greater change in the same direction. A negative feedback represents a process in which the body senses a change, and stimualte mechanisms to reverse that change. In case of blood cloting process each step release a chemical which amplify the nex step of the process and ends with blood clotting and in the same way uterine contraction and ovulation are controlled by positive feedback.

2. Option E is correct. Circulatory system consist of three main component. Heart, lungs and capillaries. The main function of circulatory systam is transportation of nutrients, gases (oxygen and carbondioxides) and hormones. It also regulate body temperature, fluid pH and cell contents. It also play a role in ATP production by transporting oxygen to the tissues.

3. Option A is correct. All the hormone released by hypothalamus (Thyrotropin-releasing hormone - TRH Gonadotropin-releasing hormone -GnRH, Growth hormone-releasing hormone - GHRH, Corticotropin-releasing hormone - CRH, Somatostatin, Dopamine) are released into the blood in the capillaries and goes immediately to a second capillary bed in the anterior lobe of the pituitary, where they exert their effects.

4. Option B is correct. TRH (thyrotropin releasing hormone) release from hypothalamus which acts on anterior pituitary and stimulate it to release TSH (Thyroid stimulating hormone) and prolactin. TSH further stimulates thyroid gland to produce thyroid hormone.

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