Nokea
The mammary gland:
- A. is an erectile organ;
- B. is part of the internal genital organs;
- C. is an accessory gland of the female reproductive system;
- D. is a pair organ;
Correct Answer: C
Rationale: Step-by-step rationale:
1. The mammary gland is not an erectile organ, eliminating choice A.
2. It is not part of the internal genital organs, ruling out choice B.
3. The mammary gland is indeed an accessory gland of the female reproductive system, making choice C correct.
4. Lastly, the mammary gland is a pair of organs, which supports choice D as incorrect.
Therefore, choice C is correct as the mammary gland functions as an accessory gland in the female reproductive system.
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When do the testes begin to descend?
- A. at birth
- B. two months after birth
- C. two months prior to birth
- D. in the fifth month of pregnancy
Correct Answer: D
Rationale: The correct answer is D: in the fifth month of pregnancy. The testes begin to descend from the abdomen into the scrotum during the fifth month of pregnancy. This process is crucial for proper development and function of the testes. Descending at this stage allows for the testes to be positioned outside the body, which is essential for sperm production as it requires a slightly lower temperature than the internal body temperature.
Summary:
A: at birth - Incorrect, as the descent of the testes occurs during fetal development, not at birth.
B: two months after birth - Incorrect, as the descent happens during pregnancy, not after birth.
C: two months prior to birth - Incorrect, as the descent occurs during pregnancy, not prior to birth.
When sexual feelings occur, it is important to
- A. consciously choose to act responsibly
- B. go to a quiet place and talk about what you are feeling with your partner
- C. explore the feelings and do what feels best
- D. see a doctor
Correct Answer: A
Rationale: The correct answer is A because it emphasizes the importance of consciously choosing to act responsibly when sexual feelings arise. This involves considering the consequences, respecting boundaries, and making informed decisions. Going to a quiet place to talk (B) may not address responsible actions. Exploring feelings and doing what feels best (C) may lead to impulsive or harmful choices. Seeing a doctor (D) is not necessary for regular sexual feelings. A conscious and responsible approach promotes healthy relationships and personal well-being.
People lacking melanocytes are deaf. These cells function as part of:
- A. Hair cells
- B. modiolus
- C. spiral limbus
- D. stria vascularis
Correct Answer: D
Rationale: The correct answer is D: stria vascularis. Melanocytes are present in the stria vascularis of the cochlea, which is essential for maintaining the endocochlear potential and supporting the function of the hair cells. Without melanocytes, the stria vascularis cannot maintain the proper ion balance necessary for hearing, leading to deafness.
A: Hair cells are responsible for converting sound vibrations into electrical signals and are not directly related to melanocytes.
B: The modiolus is a bony structure in the cochlea that houses the spiral ganglion, which transmits signals from the hair cells to the brain. It is not directly involved with melanocytes.
C: The spiral limbus is a structure in the cochlea that supports the organ of Corti and is not directly related to melanocytes.
Spasm of sternocleidomastoid muscle in the neck causes:
- A. Talipes equinovarus
- B. Torticollis
- C. Cleft lip
- D. Kyphosis
Correct Answer: B
Rationale: The correct answer is B: Torticollis. Spasm of the sternocleidomastoid muscle in the neck causes the head to tilt to one side and the chin to rotate to the opposite side, leading to a condition known as torticollis. Talipes equinovarus (A) is a foot deformity, cleft lip (C) is a congenital facial anomaly, and kyphosis (D) is an abnormal curvature of the spine. These conditions are not directly related to the spasm of the sternocleidomastoid muscle in the neck.
The spermatozoon contains:
- A. 11 pairs of somatic chromosomes;
- B. one sexual chromosome;
- C. the X sex chromosome;
- D. the Y sex chromosome;
Correct Answer: D
Rationale: The correct answer is D because the spermatozoon contains the Y sex chromosome, determining male characteristics. Sperm cells are haploid and carry only one set of chromosomes, including either an X or Y sex chromosome. The presence of the Y chromosome leads to the development of male offspring. Choice A is incorrect as sperm cells do not contain somatic chromosomes. Choice B is incorrect as sperm cells contain one pair of sex chromosomes, not just one. Choice C is incorrect because sperm cells can carry either the X or Y sex chromosome, not specifically the X chromosome.