The structure that connects the fetus to the uterine wall and allows nutrient exchange is the:
A. Amnion
B. Placenta
C. Yolk sac
D. Umbilical cord
Answer: Option B
Solution (By JKExamLibrary)
The placenta is a temporary organ formed by both fetal (chorion) and maternal (endometrium) tissues. It facilitates the exchange of oxygen, nutrients, and waste products between mother and fetus, and produces hormones (e.g., hCG, progesterone). The umbilical cord connects the fetus to the placenta. The amnion surrounds the embryo.
Explanation:
Human somatic cells have 46 chromosomes: 44 autosomes and 2 sex chromosomes (XX or XY). Sperm cells are haploid (n=23), containing 22 autosomes and one sex chromosome (either X or Y). The ovum also has 22 autosomes and one X. Fertilization restores 44 autosomes plus XX or XY. So sperm has 22 autosomes.
Explanation:
Thyroxine (T₄) and triiodothyronine (T₃) from the thyroid gland increase the metabolic rate of most tissues, heat production, and oxygen consumption. Insulin and glucagon regulate glucose, cortisol is a stress hormone with metabolic effects but not the primary basal regulator. Hypothyroidism leads to decreased BMR.
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