1. THE CIRCULATORY SYSTEM

2. The Function of the Circulatory System
The main role is to transport nutrients, carbon dioxide, oxygen, hormones, and wastes through the body.

3. Main Organs of the Circulatory System:
Heart
Blood
Vessels

4. Functions of the Heart Generating blood pressure Routing blood
Heart separates pulmonary and systemic circulations
Ensuring one-way blood flow
Heart valves ensure one-way flow
Regulating blood supply
Changes in contraction rate and force match blood delivery to changing metabolic needs

5. Pulmonary circuit
The blood pathway between the right side of the heart, to the lungs, and back to the left side of the heart.
Systemic circuit
The pathway between the left and right sides of the heart.

6. THE HEART
The heart causes blood to flow throughout the body because of it’s pumping action;
The human heart has 4 chambers;
The top 2 are called the atria; they receive blood
The bottom 2 are called ventricles and they pump the blood out of the heart

7. Interior & Exterior of Heart

9. BLOOD Made of liquid and solids parts
Bright-red when full of oxygen and dark-red when it is oxygen poor
Very important because blood is what carries nutrients, wastes, and gasses throughout the entire body

10. PARTS OF BLOOD:
The liquid part of the blood is known as plasma. It is 97% water. It enables the solid particles to flow through the vessels.

11. The solid parts are white blood cells, red blood cells, and platelets.
Red blood cells (Erythrocytes)- Red Blood Cells
Carry hemoglobin and oxygen. Do not have a nucleus and live only about 120 days.
Can not repair themselves.
carry oxygen molecules

12. White blood cells-Leukocytes
fight disease
Fight infection and are formed in the bone marrow
Five types – neutrophils, lymphocytes, eosinophils, basophils, and monocytes.

13. Platelets-Thrombocytes
make blood clots so you don’t bleed to death
These are cell fragment that are formed in the bone marrow from magakaryocytes.
Clot Blood by sticking together – via protein fibers called fibrin.

14. Blood traveling through vessels

15. BLOOD VESSELS 3 types of vessels: Arteries, Veins, and Capillaries
Arteries take blood away from the heart and are thick and muscular
Veins take blood back to the heart and are thin
Capillaries are microscopic and hook to the individual cells

16. ARTERIES

17. VEINS

18. Capillaries

19. Disorders of the Circulatory System
Anemia - lack of iron in the blood, low RBC count
Leukemia - white blood cells proliferate wildly, causing anemia
Hemophilia - bleeder’s disease, due to lack of fibrinogen in thrombocytes
Heart Murmur - abnormal heart beat, caused by valve problems
Heart attack - blood vessels around the heart become blocked with plaque, also called myocardial infarction

21. REAL HUMAN HEART