Science

Book notes

Organs and function of

Digestive system

Stomach, liver, large and small intestine, pancreas

breaks down food, absorbs the nutrients and excrete the waste

Organs and function of

Nervous system

Brain, spinal cord

sensitivity and your personality, movement.

Organ and function of

Locomotor system

Bones, muscles

for movement

Adaptations of Red blood cell

No Nucleus : filled with red haemoglobin carry oxygen

Very small : fit into the smallest blood vessel

Adaptations of Nerve cell

Long and thin: carry electric impulses in the body

Lots of endings: make connections to other nerve cells

axons and dendrites

Adaptation of Sperm cell

Head section is pointy,: helps fuse with the egg cell and fertilize … contains enzymes

head has big nucleus: carries the genetic material: DNA

middle section has : provide energy for the sperm to swim

mitochondria

Long tail: moves side to side to the sperm to the Egg

Adaptations of Muscle cell

change shape: contract or relax, producing movement

work together: forms muscle, pull on the bones or organs making them move

contain many Mitochondria: Mitochondria provide energy for movement and ribosomes produce protein to build muscle

Adaptations of Root hair cell

long thin shape: fits between grains of soil, reaches water

Large surface area: allows osmosis and diffusion of water and minerals into the cell

Large Vacuole: stores water and minerals

Adaptations of Palisade cell

Contains chloroplasts: combine chlorophyll and sunlight to generate oxygen and carbon dioxide ( sugars)

Large surface area: maximise exposure to light

Tall, long shape; large number of cells fit in a leaf

Fallopian tube

Take egg cell to Uterus

Ovary

produce egg cells

what is the Uterus

where the baby develops

Cervix

muscle at the entrance to Uterus

Vagina

tube leading to the outside

Bladder

holds urine

Glands

add liquid to sperm cells

Sperm ducks

between testies and Urethra

Urethra

carry sperm and urine outside

Testies

where sperm cells are made

Scrotum

Holds and protects testies and keep them cool

Penis

Contains Urethra

Foreskin

Protects Penis

Where does implantation happen

In the lining of the Uterus

Umbilical Cord

Carries oxygen, food and waste between mother and baby

What is the job of the Placenta

Takes oxygen and food from the mother’s blood and puts waste into mother’s blood

Amniotic fluid

Protects baby

Which disease can damage a Foetus

Rubella

When a baby is developing the organ attached to the navel is the

Placenta

What is it called when a egg is released

Ovulation

How long after the start of a period is fertilisation most likely to occur

11-17 days

What are Gamets

A specialised reproductive cell or sex cell- used in sexual reproduction.

How many chromosomes do you get from your Mum

23

What 2 cells carried your chromosomes before you were born

sperm cell and egg cell

After fertilisation were does the zygote go

To the lining of the Uterus for implantation