Jiho biology Reproduction in humans

What does testis do

produce sperm and male sex hormones such as testosterone

WHat does scortum do

helps to maintain a lower temperature for healthy development of sperms

Prostate gland **

release fluids that contain nutrients and enzymes that are needed to activate the sperm cells mixture of fluids and sperms = semen

What does penis do

Erectile organ that becomes hard during sexual sexual intercourse to deposite sperm containing semen into the vagina.

a sperm has haploid gametes and acrosome = enzyme breakdown egg membrane

OKIDOKI

ovaries does what

produce ovum and female sex hormones such as oestrogen and progesterone

oviduct is the

site of fertilisation

uterus is hwere the

foetus develop

uterine lining is where

implantation occurs

cervix is the

circular ring thing above vagina but below the uterus
Control the blood flow and widen during pregnancy

define menstrual cycle**

The monthly discharge of blood, uterine lining and unfertilised ovum from the uterus via the vagina. 28 days

timeline in menstrual cycle DESCRIBE from day 1 to 5 , from 6 to 9 to 10 15 and 16 to 28 ***

from day 1 to 5 menstruation occurs
Day 6 to 9 , repair of uterine lining
Day 10 to 15 ovulation occurs ( release of a mature ovum into the oviduct)
DAy 16 to 28 Wait for successful implantation

→ upon successful implantation progesterone level remains high

fertilisation ***

Nucelus of the male haploid gametes fuse with nucleus of the female haploid gamete to form a diploid zygote.

what happens to the little zygote during tis development

the beating of fthe cillia lining sweeps the zygote alone the oviduct, the zygote tarvels down the oviduct, and divides by mitosis to develop into an embryo

implantation occurs when EMBRYO embdedded on the uterine lining.

How does embryo develop** ( placenta, embryo villi, projections umbilical cord)

finger like projections called villi grow from the embryo into the uterine lining
the embryonic villi and the uterine lining make up the placenta
The umbilical cord attaches the embryo to the placenta

WHat does amniotic fluid do **

• Cusions and protects the fetus from physical injury

• lubricate for movements for muscular development

• birthcanal lubrication for childbirth

function of placenta ***

• it allows the diffusion of oxygen, dissolve food substances and antibodies from maternal blood to fetal blood

• Diffusion of metabolic waste products from fetal to maternal

• produce progestone for uterine lining maintenance

the umbilical artery goes against the normal flow

carries away from fetus, hence it is umbilical artery. IT CARRIES BLOOD TOWARDS THE HEART

An STI is a disease that is spread through

sexual intercourse, and are etiher bacteria or virusses

we can prevent stis by sticking to one

sexual partner, use condom, avoid blood transfusions from unhygienic places. Sharing of hypodermic needles