CIRCULATION OF BLOOD

INRODUCTIONCirculationThe circulatory system is an organ system that permits blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones, and blood cells to and from cells in the body to nourish it and help to fight diseases, stabilize body temperature and pH, and to maintain homeostasis.

BLOOD

Blood circulates through the body Blood carries nutrients (food) ,oxygen and many other substances  to all cells of the body 

It carries away waste products without access to the blood, cells and body tissues die 

CIRCULATORY SYSTEM

HeartArteriolesVeinsVenulesCapillariesArteresBlood

THE MAIN FEATURES OF CIRCULATION

To transport Nutrients Wastes Oxygen and Carbon dioxide Hormones

THE DIFFERENT TYPES OF CIRCULATIONS

1. Single circulation

2. Duble circulation

SINGLE CIRCULATION

Single Circulation has only one circuit - the

heart has only one chamber and 2 pumps

The heart has pump blood through only one

direction

Eg: Fish

DOUBLE CIRCULATION

Duble circulation has tow different circuits

One for oxygenated blood and the other for de

oxygenated blood

Eg: Human heart

Duble circulation

In duble circulationthe blood circulates twice,

once for oxygenated blood and the other for

deoxygenated blood.

DUBLE CIRCULATION

Pulmonary circulation

Heart- Lung

Systemic circulation

Heart- Tissue capillaries

DOUBLE CIRCULATION IN HUMANS

Heart BloodBlood

vesselsCirculatory

system

HOW IT IS WORK?

Lung

All other parts of the body

The mammalian The mammalian circulation plancirculation plan pulmonary

circulation

systemic circulation

As blood passes through heart twice, this also known as double circulation

THE PULMONARY CIRCULATION

2 The Deoxygenated blood is pumped through pulmonary artery.

3 The blood becomes oxygenated

4 The Oxygenatedblood flows through pulmonary veins to left auricle

1. Deoxygenated blood in right ventricle

Lung capillaries

absorbs oxygen and loses carbon dioxide

Oxygen-rich blood

Pulmonary veins

carry oxygen-rich blood

THE SYSTEMIC CIRCULATION

The human circulatory system

1. Oxygenated blood in left ventricle

2 The oxegenated blood is pumped through aorta to all parts of the body except lungs

3 O2 and nutrients diffuse into cells while CO2 and wastes diffuse out

4 The blood flows through inferior/ superior vena cava to right auricle

Oxygen-rich blood returns to the heart through pulmonary veins

Left ventricle pushes the blood out through the main artery, the aorta

CAUSES OF IMPAIRED BLOOD CIRCULATION

Impaired or poor blood circulation result of age, lifestyle or disease, accumulation of free radicals

Lack of oxygen reduces the energy level

in cells and waste products accumulate in

both muscles and connective tissue.

Pain and other illness may occur in several

places in the body.

SIGNS OF IMPAIRED BLOOD CIRCULATION

Pain while walking Muscle cramps (common at night) Cold hands and feet Restless legs Swollen legs and feet Slow healing of injuries/ wounds Myocardial infarction (heart attack) Stroke

MEASUREMENT OF BLOOD CIRCULATION

even when the blood pressure is normal, blood circulation may be seriously impaired!

awareness of the causes and effects of poor blood circulation is very important

ADVANTAGES OF DOUBLE CIRCULATION

In humans the blood pressure can be increased after it

has left the lungs. It is faster. Humans are more active

and need to produce more energy and heat.

DISADVANTAGES OF DOUBLE CIRCULATION

Double circulation is much more efficient than single.

Oxygenated and Deoxygenated blood exchange takes

place at one time in our body.

CONCLUSION In our body the blood circulates twice, once the

pure(oxygenated) blood is pumped by the left ventricle to the other parts of the body and comes back to the heart at the right auricle(one circulation complete), secondly the blood from the right ventricle is pumped to the heart for purification and comes back to heart at the left auricle (this is second circulation). This is called double circulation.

THE END