Chapter 21 - Reproduction in Humans

Mature eggs

________ are released from the ovaries into the oviducts.

tail

The structure in a sperm cell which beats to propel the sperm towards the egg.

male sex

The fluids from the ________ glands that make up semen provide nutrients and protection for the sperms, as well as a medium for them to swim in.

Progesterone

maintains the endometrium by causing it to become thicker.

smooth muscles

The ________ in the uterine wall contract to expel the fetus during birth.

placenta

provides nutrients (glucose, amino acids and mineral salts) and oxygen for the embryo.

Cilia

Lined in the inner lining help move the ovum to the uterus.

sexual intercourse

The process during which semen containing sperms is deposited into the vagina of a woman.

sperm

The male gamete, which consists of a head, middle piece and tail.

Semen

a composition of sperm and fluids from the sex glands containing nutrients and enzymes which nourish and activate the sperm, allowing them to swim actively.

birth canal

It forms the ________ through which the baby is born.

Immune Deficiency Syndrome

Acquired ________ (AIDS) is a disease that can be spread through sexual intercourse.

scrotum

The pouch like bag which holds the two testes out of the body.

Spread of HIV

________ can be prevented by: (a) Having protected sexual intercourse.

ovum

The female gamete, which is a large cell containing abundant cytoplasm.

endometrium

The ________ breaks down and flows out of the body.

28

The menstrual cycle normal span time (days)

endometrium

The tissue in females richly supplied with blood vessels and is the site of implantation of the embryo post-fertilisation.

Human Immunodeficiency Virus

It is caused by a virus called ________ (HIV)

uterus

a thick muscular organ in females that can stretch as the fetus increases in size during pregnancy.

large nucleus

It has a(n) ________ containing a haploid set of chromosomes.

seminal vesicles

a pair of glands in males that secrete a fluid that makes up a proportion of semen.

Prostrate gland

a large gland in males which secretes directly into the urethra through several small ducts.

Oviduct

a narrow muscular tube leading from the ovary to the uterus.

Zygote

Fertilized ovum

Embryo

Hollow ball of cells

AIDS

The disease which shows the symptoms: Persistent fever, sweat, swollen glands, chills, weakness and weight loss