The Role Of Blood

1. Blood delivers digested nutrients from fats, proteins, and carbohydrates to all body cells.

2. Blood delivers oxygen to all body cells.

Blood Functions

3. Blood delivers chemical messengers to some body cells.

4. Blood delivers water, minerals and vitamins to cells

Pick Up Jobs Of Blood

1. Blood picks up carbon dioxide waste from cells and carries it to the lungs.

2. Blood picks up chemical waste from cells and carries it to the kidneys.

3. Blood moves excess heat into the skin.

4. Helps to fight diseases

5. Helps stop bleeding

Assignment

Questions 1, 2, 3 page 245

Parts Of The Human Blood

Plasma Red blood cells White blood cells Platelets We will discuss the roles of each of these

parts in the following slides

PLASMA

Plasma is the nonliving, yellow part of blood

Blood plasma is 92% water

The remaining 8% is made up of blood proteins

Nutrients Salts Waste chemicals Most of the pickup and

delivery is carried out by the plasma

RED BLOOD CELLS

Red blood cells are cells in the blood that carry oxygen to the body tissues

Make up most of the blood

There are about 5 million red blood cells in a drop of blood

Red blood are the living portion of blood

Give the red color to blood

Are round, thin centers and wide edges

Life span 120 days Made in bone marrow

ROLES OF RED BLOOD CELLS

Deliver oxygen to all body cells, oxygen is picked up by RBCs in the lungs, carried by the plasma to all parts of the body

RBC contain hemoglobin(protein) which makes carrying oxygen possible

Hemoglobin contains the mineral iron

Low RBC count can cause anemia which makes a person tired and weak and short of breath

Caused by too little oxygen reaching body cells

WHITE BLOOD CELLS

Cells in blood that destroy harmful microbes, remove dead cells and make proteins that help prevent disease

Part of the living portion of blood

Have a nucleus Are larger than RBCs Live for months, or

years Most though have a life

span of 10 days Healthy person has

8000 in a drop of blood

WBCs are made in in the spleen, thymus gland, and tonsils

ROLES OF WHITE BLOOD CELLS

WBCs attack and destroy bacteria at the point of infection

WBCs also destroy or “eat” dead cells

fig. 12-6

Assignment Research the disease

Leukemia, and hand in a short presentation of the disease

PLATELETS

Living part of the blood Platelets are cell parts that

aid in forming blood clots. Are not complete cells Smaller than RBCs Drop of blood contains

250,000 platelets

Life span, about 5 days Made in the bone

marrow Assignment Research hemophilia

and present the particulars of the disease

ASSIGNMENT

Page 252 questions 6, 7, 8

BLOOD TYPES

There are different types or kinds of blood You will given blood usually by a person

who has the same type as you If the wrong type of blood is given serious

problems, even death can occur.

BLOOD TYPES

There are four main blood types

A, B, AB, O The difference is due to

the proteins found on the RBC and in the plasma

Refer to the transparency master found in your handouts

MIXING BLOOD TYPES

Red cell and plasma proteins have different shapes

Type AB and type B blood

cannot be mixed

Proteins in the plasma of type A blood fit like puzzle pieces into the RBC protein shape of type B blood

These types will mix and form clumps that cannot move the capillaries

ASSIGNMENT

Page 255 questions 11, 12, 13

HOW THE IMMUNE SYSTEM WORKS

Prevents microbes from entering the body

Makes chemicals or cells that destroy microbes

Skin, mucus, tears in eyes

Antibodies, white blood cells

Antibodies are chemicals that help destroy bacteria or viruses that enter our bodies

Antigens are foreign substances, usually proteins, that invade the body and cause diseases

WBC make numerous antibodies, but the antibody must fit with the antigen shape in order to be killed. They must fit together like lock and key.Fig. 12-13 pg. 257

Each virus or bacteria had a different antigen on its surface. When the correct shape is found, the body makes more WBC in that shape, their job is to prevent future disease caused by the virus or bacteria

If the same disease enters your body in the future, WBC will be made to fight the disease

These antibodies will stay in your bloodstream for days to years

ASSIGNMENT

Choose one of the following diseases Diphtheria, Tetanus, Pertussis, Polio, Measles, Rubella,

Mumps 1. Is it a virus or bacteria 2. What happens to your body when you have the disease 3. Is there a vaccine for the disease 4. Please add some statistics concerning you disease. Page 259 questions 16, 17, 18