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

Consists of 3 cell layers

ArteryCarries blood

away from the heart

Inner Layer Middle Layer External Layer

Mostly composed of muscle tissue

Smooth, allows blood that comes through it to flow

more freelyConsists of flexible connective tissue

Contains blood under high

pressureHave small

passageways for blood to flow

through

Lumen

Vein

(Inner layer)

Vein

Carries blood to

the heart

Thin walls

Prevents back flow of blood

Valves

Causes contractions of the beating heart

Creating the correct blood flow into the

arteries

Contains blood under low pressure

Transports waste-rich blood

capillaries

Gas exchange

occurs here

Microscopic1 cell thick

Has only 1 layer

Very low blood

pressureFound in the muscles and

lungs

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