Anatomy Questions
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Delivers sperm in to the female's body. Eliminates urine from the body.
Facial and body hair growsVoice breaks and deepensShoulders get broaderAdam's apple developsDenser bones
1. Secretes progesterone and therefore maintains the thickness of the lining of the uterus and prevents the uterus from breaking down.2. Enables exchange of materials between the mother and the fetus, provides a physical attachment to the uterus, prevents maternal and foetal blood from mixing, protects fetus from high blood pressure of mother.
The head contains the nucleus which contains 23 chromosomes from the father. The acrosomal vesticle contains enzymes to digest the wall of the egg cell. The tail of the sperm plays an important role as it swims and helps drive the sperm forward and towards the egg cell.
The zygote begins to divide very soon by mitosis to form a ball of cells called an embryo. As it divides, it moves down the oviduct to the uterus. Once the embryo reaches the uterus it will implant in to the soft lining. Some of the cells of the embryo grow in to villi which fix to the wall of the uterus. Villi also develop from the wall of the uterus. The two sets of villi grow closely together to form the placenta. Other cells form a bag called the amniotic sac. The remaining cells continue to divide to produce a foetus. Inside the villi own the foetus's side of the placenta are millions of tiny blood capillaries. Blood is returned to the foetus along the umbilical vein and leaves the foetus from the umbilical artery which are both contained in the umbilical cord.
either two openings in the nose trough which air moves when you breathe
the muscle which separates the chest from the lower part of the body
Features of the body which develop at puberty, as a result of the increased secretion of sex hormones.
either of the two organs in the chest with which people and some animals breathe
Only the head enters the egg where it fuses with the nucleus. The fusion is called fertilisation and fertilised egg cell is called a zygote.
Tune running from the bladder through the prostate to the end of the penis which carries urine and semen out of the body.
The organ in a mammal in which the embryo develops. It has very thick muscular walls.
the main airways dividing from the trachea transporting oxygen (in) and CO2 (out) to the lungs.The bronchi (pl.) branch into smaller tubes called bronchioles.
Menstrual cycle beginsHips widenBreasts developSebaceous glands secrete more sebumBody hair grows in pubic areas
the structure of ribs that protects your heart and lungs in your chest
a muscular hollow organ between the nose and the lungs which contains the tissue that moves very quickly to create the human voice and many sounds
Many sperm reach the egg as they are attracted by the chemicals it produces. Each sperm has a sac of enzymes at the tip of its head which can digest a way into the egg. Once one sperm has succeeded in penetrating the membrane of the egg, a change takes place around the egg which prevents any other seem from penetrating.
The egg matures and develops. FSH ( which stimulates the development of the follicle) causes a follicle to develop inside an ovary. The developing follicle secretes oestrogen.When the follicle is fully developed, a surge in LH (which causes ovulation) causes ovulation to occur - this usually happens on day 14.The yellow body secretes progesterone and the egg travels down the oviduct. LH and FSH levels fall and the empty follicle stops secreting oestrogen, and starts secreting progesterone. The empty follicle is now called a corpus luteum.
Delivers eggs from the ovaries to the uterus ( lined by ciliated epithelium cells which waft the egg).
Exchange of gasses (oxygen and CO2) between the air in the lungs and the blood in the capillaries occurs