Explanation

The layer of the uterus that nourishes the embryo after implantation is the Endometrium [1, 2]. 

Endometrium:

This is the inner lining of the uterus.

It thickens and becomes rich in blood vessels and glands each month to prepare for a potential pregnancy.

After implantation, the developing embryo is embedded in this layer and receives nourishment from it [1, 2].

Myometrium:

This is the thick middle layer of smooth muscle that makes up the bulk of the uterus.

Its primary function is contraction during childbirth and menstruation [1, 2].

Perimetrium:

This is the outer serous layer that covers the outer surface of the uterus, providing protection and structure [1].

Cervical epithelium:

This tissue lines the cervix (the lower, narrow part of the uterus that opens into the vagina) and does not play a direct role in nourishing the embryo after implantation within the main uterine body [1]. 

Explanation

Spermatogenesis occurs in the seminiferous tubules within the testes. 

Seminiferous tubules:

These are tiny, coiled tubes inside the testes where sperm production actually takes place. 

Vas deferens:

This is a duct that transports mature sperm from the epididymis to the ejaculatory duct. 

Scrotum:

This is the pouch of skin that holds the testes. 

Epididymis:

This is a coiled tube located behind the testes where sperm mature and become fully functional. 

Explanation

• Chemical digestion of proteins begins in the stomach
• Mechanical digestion (chewing) starts in the mouth,
• The chemical breakdown requires gastric juices, specifically hydrochloric acid (HCL)
• The enzyme pepsin activates and breaks down protein molecules.

Last updated by NS on 20-April-2026

Explanation

ADH (Antidiuretic Hormone) is secreted by the posterior part of the pituitary gland.

It regulates water reabsorption in the kidney, controlling the water content of the body.

Explanation

Adhesion is the property of water molecules to stick to other polar surfaces, like wood or glass.

It occurs due to hydrogen bonding between water molecules and the polar molecules of the surface.

Explanation

The fallopian tube carries the ovum from the ovary to the uterus.

Fertilization typically occurs within the fallopian tube before the zygote moves to the uterus.

Explanation

Darwin proposed that natural selection drives evolution by favoring individuals with beneficial traits.

Over time, these traits become more common in the population, leading to evolutionary change.

Explanation

Kupffer cells are specialized macrophages in the liver.

They perform phagocytosis, removing bacteria, debris, and old red blood cells from the blood.

Explanation

Collagen is a fibrous protein, providing structural support in connective tissues.

Enzymes, hormones, and channel proteins are globular proteins with functional roles in metabolism and signaling.

Explanation

Amino acids are linked by peptide bonds between the carboxyl group of one amino acid and the amino group of another.

This forms a polypeptide chain, which folds into a functional protein.