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2 November 2019

circulatory system of Human Body|Human Circulatory system|ICDS Supervisor Kerala PSC

Circulatory system of Human Body|Human Circulatory system|ICDS Supervisor Kerala PSC

In this post, the details of circulatory system of Human Body is added which are very useful for ICDS Supervisor Exam. Kerala PSC and other states PSC's are conducting Exams for ICDS Supervisor. Study materials are available for other topics also like Home ScienceFood and NutritionPsychologyPhysiologyMicrobiologySociology and Nutrition and Health for ICDS Supervisor Kerala PSC Exam

circulatory system

The circulatory system transports respiratory gases, nutrient molecules, wastes, and hormones throughout the body. 

These materials are carried by an intricate network of blood vessels, which follow continuous circuits from the heart through arteries, capillaries, and veins back to the heart.

The circulatory system also regulates our body temperature.

The heart pumps by rhythmically contracting and relaxing.

The heart pumps the blood to keep it circulating.

 It is made of cardiac muscle, which is relaxed when blood enters the atria and ventricles.

Then there is a slight contraction of the muscles at the top of the heart, which forces more blood into the ventricles.

The main heart muscles (at the bottom of the heart) contract to force blood out of the ventricles.

One-way valves prevent blood from going back into the atria. 

Blood flows out of the right ventricle through the pulmonary arteries into the lungs, and out the left ventricle through the aorta to the rest of the body.

When the heart relaxes again, blood starts to flow from the aorta and pulmonary valves back towards the relaxed ventricles. 

But it pushes against the semilunar valveswhich snap shut.

Electrical signals make the heart rhythmically contract.

An electrical signal is generated by the SA nodeand it makes the muscles of the atria contract. 

The signal spreads but is slightly delayed in the AV node, which allows the atria time to empty.

Then it reaches the bottom of the heart and travels up the sides of the ventricles, causing them to strongly contract.

Valves allow blood to flow in only one direction.

Valves automatically close when blood pushes in the wrong direction.

Your heartbeat sounds like lub-dup, lub-dup, lub-dup... The sound lub comes from blood in the ventricles pushing against (and closing) the  AV valves to the atria. 

The dup comes from the semilunar valves snapping shut after blood is forced out of the ventricles.

Valves similar to these are found in some veins, and in the lymphatic system, as well as in the heart.

Arteries carry blood from the heart to all parts of the body; all arteries (except the pulmonary arteries) carry oxygenated, red blood

Veins carry blood from all parts of the body back to the heart; all veins (except the pulmonary veins) carry blood that is depleted of oxygen and therefore bluish in color.

Capillaries: very narrow tubes not shown in the diagram, they connect the ends of all arteries to veins; they deliver and pick up
gases, nutrients, and waste products

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