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- -Transports gases and other substances throughout the body!
- -Three main components : Central pump(heart), Vascular system (blood vessel), Circulating fluid (blood)
The cardiovascular system has 3 types of blood vessels. List them and their functions.
- Arteries, Capillaries, Veins.
- A-carry blood away from the heart
- C-permit exchange f materials with tissues
- V-carry blood toward the heart
Arteries have three layers. Name them
Endothelium, Middle layer, Outerlayer.
What is the largest artery in the human body?
- The aorta.
- -is 25mm wide
- -carries o2 rich blood from heart to other parts of the body.
- -branch off into arterioles.
- -Join arterioles to venules
- -exchange of substances across thin walls
What are the 2 forces that control movement of fluid through a capillary wall?
Blood pressure (water from blood to tissues), osmotic pressure(water from tissues to blood).
- -Veins and venules take blood from the capillary beds to the heart.
- -Venules drain blood from capillaries and join them to form a vein
- -Blood flow in veins is primarily dependent of skeletal muscle contraction.
-A connective tissue with a liquid matrix.
List some of the functions of blood.
Transport(nutrients, wastes, hormones), Regulation(body temperature, blood & osmotic pressures, pH), Protection(disease-causing pathogens, excess loss of blood by clotting mechanisms.
-Contains inorganic and organic substances dissolved or suspended in water.
- Transport-albumin transports bilirubins, lipoproteins transports cholesterol
- Blood clotting-fibrinogen
- Fight disease- immounoglobulins
Red Blood Cells: Facts and Function
- -Manufactured in red bone marrow of certain bones
- -Contain hemoglobin
- -120 day lifespan (possibly due to lack of nucleus
- -Destroyed in the liver and spleen
White Blood Cells : Facts
- -Helps fight infection and provide immunity
- -Divided based on structure into 2 groups
- a.granular leukocytes (have visible ganules in cytoplasm)
- b.agranular leukocytre
White Blood Cells and Disease
-If the number of any type of white blood cell increases or decreases beyond normal, it may indicate presence of disease.
- a. bacterials infections : neutrophils elevated
- b. Infectious mononucleosis : B cells elevated
- c. AIDS : T cells levels decreased
- d. Leukemia : abnormal white blood cells