Year 8 - Circulatory System

CIRCULATORY

Sciences 8

System

What will we learn?

Blood Vessels

Blood Pressure

BlooD Circulation

Virtual lab

Research

Independent practice

BLOOD

what's in it?

Components of blood

1%

44%

55%

White blood cell and Platelets

Red blood cells

Plasma

Components of Blood

Components Of BLOOD

PLASMA

• Plasma is the largest part of your blood.
• When separated from the rest of the blood, plasma is a light yellow liquid.
• Plasma carries water, salts and enzymes.
• The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it.
• Cells also put their waste products into the plasma. The plasma then helps remove this waste from the body.
• Blood plasma also carries all parts of the blood through your circulatory system.

COVID-19 and Convalescent Plasma

The use of convalescent plasma (CP) collected from previously infected individuals to passively transfer antibodies in order to protect or treat humans

Read more

• Red blood cell, also called erythrocyte
• RBCs are small, round, and biconcave that lose their nucleus at maturity.
• Make up about 99% of the blood’s cellular component.
• Red color is due to hemoglobin.
• RBCs carry oxygen from the lungs to the tissues
• Red blood cells are formed in the red marrow of bones
• Red blood cells are only 100-120 days old

RED BLOOD CELLS

• Hemoglobin is a complex protein made up of four protein strands. Iron is used to form heme groups.
• Each hemoglobin molecule can carry four oxygen atoms. The presence of oxygen turns hemoglobin bright red.

Hemoglobin

What is the difference?

Mammals

Non-mammals

Inside the Body Tissue

• Inside the Lung

• Hb + CO2 HbCO2

Carbaminohemoglobin

• White blood cell, also called leukocyte
• White blood cells defend against disease by recognizing proteins that do not belong to the body.
• White cells are able to ooze through the walls of capillaries to patrol the tissues and reach the lymph system.

WHITE BLOOD CELLS

Leukocyte

Erythrocyte

• Platelets, or thrombocytes, are small, colorless cell fragments in our blood that form clots and stop or prevent bleeding.
• Platelets are made in our bone marrow, the sponge-like tissue inside our bones. Bone marrow contains stem cells that develop into red blood cells, white blood cells, and platelets
• It has various shapes, namely round, oval, and elongated.
• It has no nucleus and granules.

PLATELETS

When you fell or got injured, and your body's part was bleeding.

can the wound heal and close?

Blood clotting

1. Platelets aggregate at the site of a wound. 2. Broken cells and platelets release chemicals to stimulate thrombin production. 3. Thrombin converts the protein fibrinogen into sticky fibrin, which binds the clot.

LET'S CHECK YOUR UNDERSTANDING

LET'S DO A RESEARCH

THANKS