Chapter 7. Transport [JHS]

Mammals transport system are made of: heart and blood vessel.
Mammals have double circulatory system because the blood travels through the heart twice.

The Heart

Heart structure are consist of cardiac muscle, atria, ventricles, and septum
The blood always remains within these vessels, and so the system is known as a closed blood system

The journey of the blood around the body:
Left ventricle -> aorta -> all parts of the body (except the lungs) -> vena cava -> right atrium -> right ventricle -> pulmonary arteries -> lungs -> pulmonary veins -> left atrium -> Left ventricle

Three main vessels that making up the blood system:
1.Arteries = vessels carrying blood away from the heart
2.Veins = vessels carrying blood towards the heart
3.Capillaries = Tiny vessels that linking arteries and veins and taking blood close to almost every cells in the body

Blood
The liquid part of blood is called plasma.
1.Red blood cells (erythrocytes)
-Red colors is caused by pigment haemoglobin (that carries oxygen)
-Red blood cells are very small
-Red blood cells are shaped like a biconcave disc
-Red blood cells have no nucleus, mitochondria, and RE

2.White blood cells (leukocytes)
-Have nucleus
-Larger than Red blood cells
-White blood cells are either spherical or irregular in shape

Transport in a flowering plant
Plants have two transport system: Xylem and Phloem
Xylem carry water and minerals
Phloem carry food materials

Transpiration is the loss of water vapour from the leaves of a plant.
The rate of transpiration is affected by:
– Humidity
– Wind speed
– Temperature

One thought on “Chapter 7. Transport [JHS]

  1. it is very gr3at 4 knowledge n the students ofbio class can get very good knowledge from this page………………………………………………………………………….

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