Question

single circulation and double circulation any Four Points​

Answer 1

SystemsThe Need for a Transport System

Very small animals (like flatworms) don’t require a special transport system because they can get the substances they need and excrete the substances don’t by diffusion alone.

However, for larger animals this is not sufficient. Larger animals require a variety of different tissues to support them. This means that they have a bigger size, so substances take longer to diffuse to an from their internal tissues; also they have a smaller surface-area-to-volume ratio, so substances can’t diffuse fast enough.

In addition, animals that are more active use substances like food and Oxygen more quickly, and also produce waste products faster, hence there is again an increased need for a special transport system.

Single and Double Circulatory Systems

The animal transport system consists of:

A fluid medium to transport substances (the Blood)

A pump to push the fluid around the body

Specialised exchange surfaces

Most transport systems also contain tubes (Blood Vessels) to hold the blood.

This is the Circulatory System, which is a very efficient transport system.

There are two types of circulatory system:

A Single Circulatory System is a simple loop in which blood flows: Heart > Gills > Body > Heart

A Double Circulatory System is a double loop in which blood flows: Heart > Lungs > Heart > Body > Heart

Explanation:

Fish have a single circulatory system, while mammals have a double circulatory system.

In a double circulatory system, the loop that goes to the lungs is called the Pulmonary Circuit, while the loop that goes to the body is called the Systemic Circuit.

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The double circulatory system is advantageous for active animals since, while in the single circulatory system the blood pressure is limited by the delicate nature of the tiny capillaries in the gills, in the double circulatory system the blood pressure can be high in the systemic circuit while remaining low and safe in the pulmonary circuit. This allows animals with a double circulatory system to be more active, since blood can reach their respiring tissues faster due to the higher pressure.

Fish are not as active as other animals, so their single circulatory system is sufficient for their needs, while more active animals like mammals need a double circulatory system.

Written by shivansh.

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Answer 2

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DOUBLE AND SINGLE CIRCULATION

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$\Large\mathcal\pink{DOUBLE \: CIRCULATION}$

Deoxygenated blood from the body tissues is poured into right atrium. Contraction of heart forces it into right ventricle. From right ventricle deoxygenated blood flows to the lungs through pulmonary artery.oxygenated blood from lungs is return into left atrium and then into left ventricle. The left ventricle forces the oxygenated blood to the whole body.thus, for making one complete round of circulation circuit around all body parts, the blood passes through the heart twice.

the pathway of blood from heart to the lungs and back to the heart is called pulmonary circulationand the pathway of blood from heart to the body and back to hurt is called system circulation this is known as double circulation of blood

$\Large\mathcal\orange{SINGLE \: CIRCULATION }$

Single circulation is the type of circulatory system that occurs in fishes in which the blood passes only one through the heart, in each complete circuit of the body compare double circulation “ single circulation a dictionary of biology

In single circulation there is no pulmonary circulation and there is only system circulation . These organism have two chambered heart and the blood is circulated one time from heart to the body

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