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Which of the following is not an accessory organ of digestion?

Salivary glands

Liver

Pancreas

Spleen

Answer and Explanation

The Correct Answer is D

A. Salivary glands are accessory organs of digestion as they secrete saliva containing enzymes to start digestion.

B. Liver is an accessory organ involved in digestion, particularly in bile production and processing nutrients.

C. Pancreas is an accessory organ that secretes digestive enzymes into the small intestine.

D. Spleen is not involved in digestion; it is primarily involved in immune function and blood filtration.

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Correct Answer is A

Explanation

A. Two haploid (n) cells; four haploid (n) cells: At the end of meiosis I, the result is two haploid cells, each with half the number of chromosomes of the original cell. At the end of meiosis II, these two haploid cells divide again to form a total of four haploid cells.

B. Two diploid (2n) cells; one haploid (n) cell: This option is incorrect because meiosis I produces two haploid cells, not diploid cells, and meiosis II produces four haploid cells, not one.

C. Two diploid (2n) cells; four haploid (n) cells: This option is incorrect because meiosis I does not produce diploid cells; it produces two haploid cells. At the end of meiosis II, the result is four haploid cells, which is correct, but the description of meiosis I is incorrect.

D. Two haploid (n) cells; one diploid (2n) cell: This is incorrect because meiosis I results in two haploid cells, and meiosis II results in four haploid cells, not one diploid cell.

A. The placenta is the organ that provides fetal nutrition, gas exchange, and waste removal. It also secretes hormones such as human chorionic gonadotropin (hCG), progesterone, and estrogen, which are essential for maintaining pregnancy and supporting fetal development. B. The blastocyst is the early stage of the embryo that implants into the endometrium, but it does not provide fetal nutrition or secrete pregnancy-regulating hormones. C. The myometrium is the muscular layer of the uterus responsible for contractions during labor, but it does not provide fetal nutrition or secrete hormones.

Correct Answer is D

Explanation

A. Ca2+: prevents the entrance of any more sperm- While calcium ions play a role in the slow block to polyspermy, the fast block involves sodium ions.

B. Na+: prevents the entrance of more Na- The fast block to polyspermy involves sodium ions (Na+), but the depolarization of the egg membrane prevents the entrance of more sperm, not just more Na+.

C. Na+: prevents the entrance of Ca2+. The fast block prevents additional sperm from entering, not calcium ions.

D. Na+: prevents the entrance of any more sperm: The fast block to polyspermy involves the opening of sodium ion channels, leading to depolarization of the egg membrane. This depolarization prevents other sperm from binding to and penetrating the egg.

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Which of the following is not an accessory organ of digestion?

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Naxlex Comprehensive Predictor Exams

At the end of meiosis I there are ___________ whereas at the end of meiosis II there is/are__________

Correct Answer is A

Explanation

A. The endometrium is the inner lining of the uterus that supports the embryo after implantation, but it does not provide direct fetal nutrition or secrete hormones for fetal development.

Correct Answer is D

Explanation

Which of the following is not an accessory organ of digestion?

Twins produced when a single egg is fertilized are called ______________twins. Twins produced from two eggs ovulated at the same time are called ______________ twins.

In the blastocyst, the trophoblast will become__________ whereas the embryoblast (inner cell mass) will become __________.

Which of the following is not involved in chemical digestion?

Pregnancy kits test for the presence of what hormone?

Women have a tendency to retain water during part of the menstrual cycle because estrogen mimics the action of what?

Where are cells with aldosterone receptors found?

A. The bicarbonate, phosphate, and protein: The major chemical buffer systems in the body are the bicarbonate, phosphate, and protein buffer systems.