Based on the reproductive statements below, please choose the correct answer Mit

Question

Based on the reproductive statements below, please choose the correct answer

Mitochondria are concentrated in the midpiece of the sperm

The SRY gene which is located on the Y chromosome produces the TDF antigen which converts the Wolfian ducts into Testes

Dihydrotestosterone is responsible for the development of the external male genetalia

The Mullerian ducts are destroyed by testosteron

Mullerian inhibiting hormone is produced by the Wolfian ducts to destroy the Mullerian ducts

The corpus spongiosum is the single spongy mass of the testes

a.)Statements 1 and 3 are TRUE

b.)Statements 5 and 6 are TRUE

c.)Statements 1,3 and 5 are TRUE

d.)Statements 2,5 and 6 are TRUE

e.)Statements 3 and 5 are TRUE

Which of the following statements concerning the endocrine system is TRUE?

a.)Tropic hormone affect the release of other hormones

b.)Non-tropic hormones affect non-endocrine target tissues

c.)Hormones rely upon duration rather than speed

d.)Both A & B

e.)All of the above

Which of the following statements concerning the coordination of airflow and blood flow is TRUE?

a.)When carbon dioxide levels in the lungs increase, it induces bronchodilation

b.)When oxygen levels in the lungs decrease, it induces vasodilation

c.)When carbon dioxide levels in the lungs increase, it induces vasoconstriction

d.)Both A & C

e.)All of the above

Explanation / Answer

It is reported by researches by (Wilson JD, 1981) that the testosterone metabolite dihydrotestosterone induces development of the prostate and male external genitalia.   Further, two secretions of the fetal testis, Müllerian inhibiting substance, (Wilson JD, 1981 and testosterone, are responsible for male development, and Mitochondria are concentrated in the midpiece of the sperm, (B Alberts 2002).

So the option c.)Statements 1,3 and 5 are TRUE.

Tropic hormone affect the release of other hormones is correct.

Non-tropic hormones are those that act directly on targeted tissues or cells, and not on other endocrine gland to stimulate release of other hormones.

The speed of a response to an extracellular signal depends not only on the mechanism of signal delivery, but also on the nature of the response in the target cell. Where the response requires only changes in proteins already present in the cell, it can occur in seconds or even milliseconds. When the response involves changes in gene expression and the synthesis of new proteins, however, it usually requires hours, irrespective of the mode of signal delivery, (Alberts, 2002), and hence hormones rely upon duration rather than speed.

The option: e.)All of the above is correct

In artificially ventilated open-chest cats and dogs ventilation with 5-15% CO2 reversed the bronchoconstriction caused by drugs or by pulmonary artery occlusion, (Astin, 1973).

Hence the option: d.)Both A & C is correct

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