circulatory system
Post on 17-May-2015
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What is the circulatory system?
• The circulatory system carries blood and dissolved substances to and from different places in the body.
• The Heart has the job of pumping these things around the body.
• The Heart pumps blood and substances around the body in tubes
called blood vessels.
Structure of the Circulatory System
Inferior Vena CavaVein that brings oxygen-poor blood from the lower part of the body to the right atrium
Tricuspid ValvePrevents blood from flowing back into the right atrium after it has entered the right ventricle
Pulmonary ValvePrevents blood from flowing back into the right ventricle after it has entered the pulmonary artery
Pulmonary VeinsBring oxygen-rich blood from each of the lungs to the left atrium
Superior Vena CavaLarge vein that brings oxygen-poor blood from the upper part of the body to the right atrium
AortaBrings oxygen-rich blood from the left ventricle to the rest of the body
Pulmonary ArteriesBring oxygen-poor blood to the lungs
Aortic ValvePrevents blood from flowing back into the left ventricle after it has entered the aorta
Mitral ValvePrevents blood from flowing back into the left atrium after it has entered the left ventricle
Left Atrium
Left Ventricle
Septum
Right Atrium
Right Ventricle
The Heart
Artery to Lungs Artery to Head and Body
Vein from Head and BodyVein from Lungs
Right Atrium Left Atrium
valve
Right Ventricle Left Ventricle
Function of the Circulatory SystemIn Respiration:• Delivers oxygen to the cells and removes carbon dioxide
In Nutrition:• Carries digested food substances to the cells of the body
Function of the Circulatory System
In Excretion:• Disposes waste products and poisons that would harm the body if gets
accumulated.
Function of the Circulatory System
Function of the Circulatory System
Other Functions
• Protects body from diseases
• WBCs ( White Blood Cells) engulf and destroys bacteria, viruses, and other harmful invaders
• Keeps the body temperature stable
• Helps carries hormones
3 Types of Blood Vessels
1. ARTERY- a blood vessel that carries blood from the heart to the body.
3 Types of Blood Vessels
2. VEIN- a blood vessel that carries blood from capillaries toward the heart.
- Carries blood that contains waste and CO2
– Exception pulmonary vein
– Blood not under much pressure
– Valves to prevent much gravity pull
– Venules: larger than capillaries
3 Types of Blood Vessels
3. CAPILLARY- a smaller blood vessel connecting arterioles with the ventricles or ventrioles
– Smallest vessel– Microscopic– Nutrients and gases diffuse here– Walls one cell thick
Composition of a Blood
red blood cellwhite blood cell
platelets plasma
Red Blood Cell
•A biconcave disc that is round and flat without a nucleus
• Contains hemoglobin, a molecule specially designed to hold oxygen and carry it to cells that need it.
•Can change shape to an amazing extent, without breaking, as it squeezes single file through the capillaries.
White Blood Cell
• The two main ones are the lymphocytes and the macrophages.
• Macrophages ‘eat’ and digest micro-organisms .
• Lymphocytes fight disease by making antibodies to destroy invaders by dissolving them
Platelets
Platelets are bits of cell broken off larger cells
Overview of the Circulatory System
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