Cardiovascular physiology

The Need for a Circulatory System

3

Lungs ( gas exchange)

Gastrointestinal tract (absorption and elimination)

Kidneys (balance of water and electrolytes)

Skin (exchange of water and electrolytes and exchange of

heat)

The Need for a Circulatory System

4

Lymphatic Circulation is associated with both

ones

High pressure system

Lowpressure system

The Arrangement of The cardiovascular system

The Arrangement of The cardiovascular system

6

Distribution of blood to the

different regions of the body

determined by:

1. Cardiac output

2.Contractile state of the

arterioles

The Arrangement of The cardiovascular system

7

Other Function of Cardiovascular System

Heart

Secretion of hormones (atrial natriuretic peptide)

Regulation of the release of other hormones (Like ADH)

Vessels

Secretion of hormones (Nitric oxide [NO], Enditheilin-1[ET-1]

and prostacyclin[PGI2])

Inflammatory responses

8

The Development of Cardiac and Vascular Function

Adaptation:

◦ During exercises

◦ During change position

Neuronal Reflexes are rapid, short-acting mechanism

Hormonal Reflexes are slow, long-acting mechanism