Download Functions of the Circulatory System

Clinical Science Team
School of Nursing and Midwifery
The Heart and blood vessels
Learning outcomes:
State component and functions of cardiovascular system
2. State the components and functions of circulatory system
3. Label a diagram of the heart, indicating its gross anatomical
features
4. State the function of the heart and blood vessels
5. State the function of the right and left sides of the heart
6. State the function of the valves within the heart
7. Describe the blood flow through the heart
8. Outline the hearts electrical conduction pathway
9. Describe the pressure changes that occur in the ventricles during
the cardiac cycle
10. Outline the neural and hormonal control of the heart
1.
Cardiovascular System Components
 Circulatory system
 Pulmonary system (Respiratory system)
 Function:
 Transport O2 to tissues and remove waste
 Transport nutrients to tissues
 Regulation of body temperature
Circulatory system
 Right side supplies the
pulmonary circulation
 Left side supplies the
systemic circulation
 Two sides are separated by a
muscular wall called the
septum
 Atria and ventricles are
separated by a dense layer
of fibrous tissue- the
fibrous skeleton
Circulatory System
 Heart
 Pumps blood
 Arteries and arterioles
 Carry blood away from heart
 Capillaries
 Exchange nutrients with tissues
 Veins and venules
 Carry blood toward heart
Systemic and Pulmonary Circuits
 Systemic Circuit
 Left side of heart
 Pumps oxygenated blood
to body via arteries
 Returns deoxygenated
blood to right heart via
veins
 Pulmonary Circuit
 Right side of heart
 Pumps deoxygenated
blood to lungs via
pulmonary arteries
 Returns oxygenated
blood to left heart via
pulmonary veins
Functions of the Circulatory System
The circulatory system has the following
main functions:
1. Transportation
2. Regulation
3. Protection
Functions of the Circulatory System
 Transportation:
1.
Respiratory: transports oxygen to the tissues and
carbon dioxide back to the lungs
2.
Nutritive: Absorbed digested products are transported
to the liver and to tissues
3.
Excretory: Waste products from metabolism are
transported to the kidneys for excretion in urine
Functions of the Circulatory System
Regulation:
 Hormonal: Hormones are carried from the
endocrine glands to their target tissues
 Temperature: The blood can be diverted to
warm or cool the body
Functions of the Circulatory System
 Protection:
 Clotting: Blood contains clotting factors and
platelets- when activated prevent blood loss through
clot formation
 Immune: Blood contains leucocytes (white blood
cells), cytokines, and complement which protects
against infective pathogens