Notes on Blood Vessels and Type of Circulation | Grade 10 > Science > Blood Circulation in Human Body | KULLABS.COM

Blood Vessels and Type of Circulation

Notes, Exercises, Videos, Tests and Things to Remember on Blood Vessels and Type of Circulation

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  • Note
  • Things to remember
  • Videos
  • Exercise
  • Quiz

Blood vessels

Blood vessels are the closed path through which blood flows to different parts of the body. They are of three types:

  1. Artery: These blood vessels carry blood away from the artery. Except pulmonary artery, all other arteries carry oxygenated blood. They have thethick wall because blood pressure in the artery is high. Arteries do not contain valves. The fine branches of arteries are called arterioles.
  2. Veins: Those blood vessels which carry blood towards heart are called veins. Except pulmonary vein, they carry deoxygenated blood. They are thin walled as the blood pressure is low in veins. As there is low blood pressure in veins there is a chance for the backflow of blood which prevents by the presence of valves. The larger structure of veins is called Vena cava and smaller branches of veins are called venules.
  3. Capillaries: The fine branches of arterioles and venules are called capillaries. Capillaries go into the tissue for gaseous and nutrient exchange. It also helps in ultrafiltration (relative filtration) in kidney

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Types of circulation:

Circulation in human beings is called double circulation as the blood enters into the heart for two times in one complete course of circulation. Mainly there are two parts of circulation:

  1. Pulmonary circulation: The exchange of blood between heart and lungs is called pulmonary circulation. It is the comparatively short route of circulation. During pulmonary circulation blood flows through these paths:

    Impure blood in right auricle ----- >Right ventricle (by opening of Tricuspid valve) ------> Pulmonary artery (by the opening of pulmonary valve) -------> Lungs (Oxygenation) -------> Pulmonary vein ------> Left auricle

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  2. Systemic circulation: The exchange of blood between the heart and various parts of the body except lungs is called systemic circulation. This route is longer than pulmonary circulation. In systemic circulation blood flows through:

    Left auricle ------> Left ventricle (by opening of bicuspid valve) -------> Aorta (by opening of Aortic valve) -------> Superior and inferior arteries ------> tissues of body (exchange of gases and waste products) (through capillaries) --------> Veins --------> Vena cava -------> Right auricle

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Blood pressure

The pressure exerted by blood in the blood vessel is called blood pressure. The normal blood pressure of a healthy person is 120/80 mm of Hg. 120 represents systolic blood pressure (blood pressure at the time of contraction of the heart) and 80 represents diastolic blood pressure (blood pressure at the time of relaxation of heart). Blood pressure is measured by sphygmomanometer. Blood pressure varies according to age, sex mental condition, physical condition etc.

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Heartbeat: Heart is the major pumping organ of the body. This rhythm of contraction and relaxation of atrium and ventricles is called heartbeat. The normal heartbeat rate for a healthy person is 72 to 80 beats per minute. Heartbeat also varies from person to person depending on age, sex mental condition, physical condition etc.



  • Blood vessels are the closed path through which blood flows to different parts of the body are called blood vessels.
  • Veins carry deoxygenated blood whereas arteries carry oxygenated blood.
  • The fine branches of arterioles and venules are called capillaries.
  • There are two types of circulation pulmonary and systematic.
.

Questions and Answers

Click on the questions below to reveal the answers

Artery

Vein

1. It has thicker and more muscular wall.

2. It has a narrow lumen.

3. It lacks valves.

4. It carries blood away from the heart.

1. It has thinner and less muscular wall.

2. It has a wider lumen.

3. It has valves to prevent back flow of blood.

4. It carries blood towards the heart

Pulmonary artery

Pulmonary vein

1. It carries deoxygenated blood from right auricle (atrium) to lungs for oxygenation.

1. It carries oxygenated (pure) blood from lungs to left auricle (atrium) for circulation.

5.5 liters of blood is present in a healthy adult. The main components of blood are plasma and 3 types of blood cells, viz, red blood cells, white blood cells and platelets.

Blood plasma makes 55% of total blood volume. It has 90% water and remaining 10% of protein, fat, minerals and carbohydrates. Three functions of plasma are as follows.

  1. It balances the flow and amount of water in the body.
  2. It dissolves and transports nutrients obtained from intestine.
  3. It takes carbon dioxide produced in the cells to lungs for excretion.

The artery that takes blood from the heart to the lungs for oxygenation is called pulmonary artery. Only this artery carries impure (deoxygenated) blood while all other arteries carry pure (oxygenated) blood.

Artery is thick-walled and carries blood pumped by heart to different parts of the body. Due to this reason, blood flows under high pressure in artery. Vein is thin-walled and carries blood from tissues towards the heart under very low pressure. As blood flows under high pressure in artery and low pressure in vein bleeding is dangerous from artery than that from vein.

Artery carries oxygenated blood pumped by the heat to different parts of the body under high pressure. But the deoxygenated blood is collected by veins to the heart under low pressure. That's why the wall of artery is thicker than vein to withstand high pressure of blood.

Blood flows under low pressure in veins. So, there is a chance of back flow of blood. To prevent this back flow of blood, veins have valves. As blood flows under high pressure in arteries, there is no risk of back flow. That's why arteries do not have valves.

Arteries and veins have many layered walls. But, capillaries have single layered wall that allow easier passage of substances. Because of this reason, exchange of substances between blood and cells takes place when the blood is flowing through the capillaries.

There are two types of blood circulation in humans. They are pulmonary circulation and systematic circulation. The circulation of blood between the heart and lungs for oxygenation is called pulmonary circulation where as the circulation of blood between the heart and all parts of the body for supplying the requirements and removing the wastes is called systematic circulation.

When blood flows through arteries, it exerts pressure to the arterial walls. The pressure experienced by arterial walls is called blood pressure. Its unit is mm of Hg.

Pressure experienced by arterial walls when the heart muscles contract (systole) is called systolic blood pressure. Its average value is 120 mm of Hg. Pressure experienced by arterial walls when the heart muscles relax (diastole) is called diastolic blood pressure. Its average value is 80 mm of Hg.

If a person has blood pressure 140/100 mm Hg, it means that person has systolic blood pressure (maximum arteriol blood pressure) 140 mm Hg and diastolic blood pressure (minimum arteriol pressure) is 100 mm Hg.

Blood pressure of a man is 130/90 mm of Hg. It means that the arterial walls in that man experiences a pressure equal to 130 mm of Hg when the heart (especially the ventricles) is contracting and a pressure equal to 90 mm of Hg when the heart (especially the ventricles) is relaxing.

Sphygmomanometer is used to measure blood pressure. The factors that affect the blood pressure of a person are- time of the day, mental condition, age, sex, physical condition, etc.

The contraction and relaxation of heart muscles pump the blood. The combined term of one contraction and one relaxation of the heart muscles is called heart beat.
The rate of heart beat depends upon sex, age and work. During heavy work and exercises, high fever, under stress and fear, the rate of heart beat increases. Likewise, the heart beat is rapid in children and during old age.

The force exerted by blood against the wall of a vessel is called blood pressure. It is greater in arteries than in vein.

It means the person has normal blood pressure i.e. systolic blood pressure is 120 mm of Hg and diastolic blood pressure is 80 mm of Hg.

The instrument used to measure blood pressure is sphygmomanometer.

Bleeding from artery is dangerous because oxygenated blood flows with a high pressure in the arteries.

The blood flowing through artery is scarlet in colour, while that flowing through veins is purple or brownish in colour. It is because the blood flowing through artery is oxygenated blood while the blood flowing through vein is deoxygenated blood.

The differences between artery and vein are as follows:
Artery Vein
  1. Arteries carry blood from the heart to the body parts.
  2. Arteries have thick walls
  3. There are no valves in the arteries.
  1. Veins carry blood from body parts to the heart.
  2. Veins have comparatively thin walls
  3. There are valves in the vein.

The differences between pulmonary artery and pulmonary vein are as follows: -
Pulmonary artery Pulmonary vein
  1. It carries impure blood.
  2. It carries blood from right ventricle to the lungs.
  1. It carries pure blood.
  2. It carries blood from lungs to the left auricle.

There are three types of blood vessels in human body which are as follows: -

  1. Veins: - It collects the impure blood from different parts of the body through capillaries to the heart.
  2. Arteries: - It carries the blood from the heart to different parts of the body.
  3. Capillaries: - It exchanges the proteinous substances, gases, etc between the blood and the cells at different parts.

The pulmonary artery carries deoxygenated blood (impure blood) from right ventricle to the lungs. The pulmonary vein carries oxygenated blood from the lungs to the left auricle.

Arteries are deep seated whereas veins are superficial. It is because blood flows at high pressure in the arteries and at low pressure in the veins. To balance the pressure in and out of the blood vessels, they are found at different depth in our body.

Veins have valve because valves prevent the back flow of blood. It may happens because, blood flows at low pressure with low speed in them. Arteries don't have valves because they carry pure blood from the heart. The blood flows at high pressure and high speed in arteries. Hence, they have no valves.

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  • The function of artery is to ______.

    carry impure blood


    carry oxygenated blood


    carry deoxygenated blood


    None of above


  • The fine branches of arterioles and venules are called ______.

    veins


    arteries


    valve


    capillaries


  • Pulmonary circulation is defined as ______.

    The exchange of blood between heart and and various parts of body.


    The exchange of blood between heart and cells.


    The exchange of blood between heart and brain.


    The exchange of blood between heart and lungs


  • What is the normal blood pressure of human being?

    120/90 mm of Hg
    120/80 mm of Hg
    Can't say
    130/80 mm of Hg
  • Which of the following is the largest blood vessel of human body?

    Capillaries


    None of above


    Veins


    Aorta


  • Pulmonary artery originates from ______.

    left auricle


    left ventricle


    right auricle


    right ventricle


  • Deoxygenated blood is carried in ______.

    Pulmonary artery


    Pulmonary vein


    Aorta


    None of above


  • Pulse beat is measured from ______.

    artery


    vein


    capillary


    Nerve


  • Closed path through which blood flows to different parts of the body are called ______.

    blood vessels


    Artery


    venis


    Capillaries


  • How many types of blood vessels are there?

    2
    4
    3
    5
  • The exchange of blood between heart and lungs is called ______.

    pulmonary circulation


    Systemic circulation


    pulmonary artery


    pulmonary vein


  • The normal heart beat rate for a healthy person is _______.

    72 to 80 beats per hour


    72 to 80 beats per second


    none of these


    72 to 80 beats per minute


  • You scored /12


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ASK ANY QUESTION ON Blood Vessels and Type of Circulation


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Forum Time Replies Report
Pratistha

Why is rupturing of artery dangerous


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P

Does pulmonary arteries have valve in them?


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Artery

Ruputation of artery is danderous.why?


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