Transport in Human

By: Hao Ling, Benjii, Jun Jie and Immanuel

Main blood vessels connected to the heart

veinarteries capillary

Inner layer

lumen

Middle layer(smooth muscle)

External layer(loose connective tissue)

Artery

artery

consist of 3 layer

Inner Layer

Smooth, allows blood that comes

through it to flow more

freely

Middle Layer

Mostly composed of muscle tissue

External Layer

Consists of flexible

connective tissue

Carries blood away

from the heart

Contains blood under

high pressure

Lumen

Have small passageways for blood to flow through

Vein

(Inner layer)

VeinValves

Prevents back flow of blood

Causes contractions of

the beating heart

Creating the correct blood flow into the

arteries

Thin walls

Carries blood to the heart

Transports waste-rich

blood

Contains blood under low pressure

capillaries

Found in the muscles and lungs

Has only 1 layer

Gas exchange occurs here

Microscopic1 cell thick

Very low blood pressure

Function of bloodCarries oxygen from the lungs nutrients from the digestive tract to the body’s cells

Carries nutrients from the digestive tract to the body’s cells

Also carries away carbon dioxide and all of the waste products that the body does not need

Helps keep your body at the right temperature

Carries hormones to the body’s cells

Sends antibodies to fight infection

Contains clotting factors to help the blood to clot and the body’s tissues to heal

Relate the components of blood to their functions:

-Plasma

Fluid part of blood

Carries carbon dioxide, hormones and waste

Yellowish liquid that is 90% water

Contains salts, glucose and proteins that carry important nutrients to the body’s cells and strengthen the body’s immune system so it can fight off infection.

-Platelets

Clump together to form clots

Protect the body by stopping bleeding

Clotting stops blood from flowing out of the body when a

vein or artery is broken.

Relate the components of blood to their functions:

Red blood cells

Contains haemoglobin which carries

oxygen

Made in the bone marrow. The more you train the more red blood cells are

made.

each have a life span of about 120

days.

White blood cells

An important part of the immune system,

they produce antibodies and destroy

harmful microorganisms

Made in the bone marrow

Most healthy adults have about 700 times

as many red blood cells as white ones

Resources from google.com.sg