ATI RN
Anatomy and Physiology of the Female Breast Questions
Question 1 of 5
In humans, the meiotic phase with the longest duration is:
Correct Answer: C
Rationale: The correct answer is C: Prophase I in females. Prophase I is the longest phase in meiosis due to the process of genetic recombination and crossing over. This phase involves pairing of homologous chromosomes, exchange of genetic material, and formation of chiasmata. These complex processes contribute to the extended duration of Prophase I. Incorrect choices: A: Anaphase I in males - Anaphase I is a relatively short phase where homologous chromosomes separate. B: Prophase II in males - Prophase II is shorter than Prophase I as it involves the formation of new spindles and nuclear envelope breakdown. D: Anaphase II in females - Anaphase II is also a short phase where sister chromatids separate.
Question 2 of 5
The normal testicular temperature necessary for its optimal functioning is around _______ below the normal body temperature:
Correct Answer: A
Rationale: The correct answer is A: 2-3°C below the normal body temperature. Testicles need to be slightly cooler than the body's normal temperature for optimal functioning. This slight decrease in temperature helps in maintaining the viability of sperm production. Choices B, C, and D are incorrect because a greater deviation from the body's normal temperature would be detrimental to sperm production. B: 4-5°C is too much of a decrease, while C: 33-36°C and D: 31-34°C are higher than the normal body temperature, which would hinder sperm production.
Question 3 of 5
Dichorionic-diamniotic twins result from separation of embryonic cells at the:
Correct Answer: A
Rationale: The correct answer is A: Four-cell stage. Dichorionic-diamniotic twins occur when the embryo splits into two separate embryos very early in development, typically at the four-cell stage. At this stage, each embryo will have its own chorion and amnion, leading to separate placentas and amniotic sacs. Choices B, C, and D occur later in development and do not result in the formation of two separate embryos with their own chorion and amnion, making them incorrect for the scenario of dichorionic-diamniotic twins.
Question 4 of 5
The inner part of the intervertebral disc is called the:
Correct Answer: C
Rationale: The correct answer is C: Nucleus pulposus. The nucleus pulposus is the inner gel-like core of the intervertebral disc that provides cushioning and flexibility. It consists of water, proteoglycans, and cells. The annulus fibrosus (choice B) is the outer ring of tough fibrous tissue surrounding the nucleus pulposus. Nucleus fibrosus (choice A) and Annulus pulposus (choice D) are not anatomically correct terms and do not describe the inner part of the intervertebral disc.
Question 5 of 5
Failure of closure of the cranial neural pore causes:
Correct Answer: A
Rationale: The failure of closure of the cranial neural pore leads to anencephaly due to the incomplete development of the brain and skull. This results in the absence of a major portion of the brain, skull, and scalp. Hydrocephaly (B) is the abnormal accumulation of cerebrospinal fluid within the brain's ventricles, not caused by the cranial neural pore closure. Hydrocephalus (C) is the same as hydrocephaly. Chiari malformation (D) is a condition where brain tissue extends into the spinal canal, unrelated to the cranial neural pore closure.