Dear student , Mammals have four chambered hear and these are: right atrium, right ventricle, left atrium, left ventricle Atria (top chambers) are connected to ventricles (bottom chambers) through valves named as bicuspid and tricuspid valves Main functions of these are as follows: Right atrium: It receives deoxygenated blood from the whole body from two major veins, the superior vena cava and the inferior vena cava Then it pumps this deoxygenated blood through the tricuspid valve into the right ventricle situated just below it Right ventricle: This is just below the right atrium and receives deoxygenated blood from the right atrium and then pumps this deoxygenated blood to the lungs through pulmonary artery Left atrium: It receives oxygenated blood from the lungs through pulmonary veins and pumps this oxygenated blood through the bicuspid valve into the left ventricle Left ventricle: This receives oxygenated blood from the left atrium above it, and pumps this oxygenated blood to entire body through aorta Regards

Ques. No. 1

Ques. No. 1 Functions of Lymph (t) Lymph is involved in transportation of substances where blood vessels do not reach. (it) Lymph carries digested and absorbed fat from intestine and drains excess fluid from extracellular space back into the blood. Checkl oint 02 I Suggest a suitable reason for the heart having four separate chambers. 2 Valves are present in between the auricles and ventricles ofthe heart. Give one reason. 3 Name an animal having two-chambered heart. 4 Name the instrument used to measure blood pressure. 5 What is the colour of lymphatic vessels? Transportation in Plants Plants lack a regular circulatory system like animals have we all know that plants prepare their food from C02 and water in their leaves. The other materials present in plant body like nitrogen, phosphorus and minerals are taken directly from the soil. The conduction of some materials to short distances occurs through diffusion while for longer distances a need of proper transportation system arises. Therefore, . two pathways have developed in plants independently which comprise of lem tissues continuou reaches all the soil a' concentrat pressure). The wate difference, is a steady that create Another xylem ove water fron The water water fron molecules from the x Transpil Loss of wa the plant i: stomata. It has follo (z) It h. (it,) It ret

Dear student ,

Mammals have four chambered hear and these are: right atrium, right ventricle, left atrium, left ventricle. Atria (top chambers) are connected to ventricles (bottom chambers) through valves named as bicuspid and tricuspid valves.
Main functions of these are as follows:

Right atrium: It receives deoxygenated blood from the whole body from two major veins, the superior vena cava and the inferior vena cava. Then it pumps this deoxygenated blood through the tricuspid valve into the right ventricle situated just below it.
Right ventricle: This is just below the right atrium and receives deoxygenated blood from the right atrium and then pumps this deoxygenated blood to the lungs through pulmonary artery.
Left atrium: It receives oxygenated blood from the lungs through pulmonary veins and pumps this oxygenated blood through the bicuspid valve into the left ventricle.
Left ventricle: This receives oxygenated blood from the left atrium above it, and pumps this oxygenated blood to entire body through aorta.

Regards

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