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BiologyClass 10ICSE

The component of blood which makes chemicals known as antibodies is: (a) platelets (b) white blood cell (c) red blood cells (d) plasma

white blood cells

BiologyClass 10ICSE

(a) What is lymphatic system? What are its function? (b) What is blood pressure? What are the two factors used to express the blood pressure of a person? (c) Name the main nitrogenous waste in the human blood. How is it removed from the blood?

The lymphatic system consists of network of organs, lymph nodes, lymph ducts and lymph vessels in the human body that make and move the lymph from tissues to the bloodstream. Following are the functions of lymphatic system: Collects and transports tissue fluid from the intercellular spaces in all the tissues, back to the veins in the bloodstream. The defense mechanism in the body by killing the germs with the help of lymphocytes present in the l

BiologyClass 10ICSE

(a) Name the red pigment which carries oxygen in the blood. (a) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds? (b) How many chambers are there in the heart of (i) an amphibian, (ii) a mammal, and (iii) a fish? (c) Describe the circulatory system in a fish.

Hemoglobin is the red color pigment that carries oxygen in the It is necessary to separate the oxygenated and the deoxygenated blood in mammals and birds as this separation allows a highly efficient supply of oxygen to the blood Humans are warm-blooded animals hence the separation of oxygenated and deoxygenated helps in regulating the body temperature. (i) An amphibian: Has a three-chambered heart, with two auricles and one A mammal has a four

BiologyClass 10ICSE

(a) What is blood? Why is it red? (b) State the functions of blood in our body. (c) Name a circulatory fluid in the human body other than blood.

Blood is a red color connective tissue that circulates in our Blood contains plasma, red blood cells, white blood cells and platelets. It is red in color because of the presence of hemoglobin. Following are the functions of blood Transportation of oxygen from lungs to all Brings waste product like carbon dioxide from cells to lungs Fights against diseases and Maintains the body temperature Lymph is a

BiologyClass 10ICSE

a) What is meant by 'heartbeat'? What is the usual heartbeat rate at rest? (b) What change occurs in heartbeats if a person runs for a while? Why?

(a) Heartbeat is the sound produced when there is contraction and relaxation of the heart. At rest, the human heart usually beats 70 to 72 times per minute. (b) A person's heart beats faster after running for a while or when a person is strained physically. After, the physical strain the person needs more oxygen. Hence the heart pumps faster.

BiologyClass 10ICSE

What is meant by 'systolic pressure' and 'diastolic pressure'? What are their normal values?

Systolic pressure: The pressure at which the blood leaves the heart through the aorta, during contraction phase. Diastolic pressure: The minimum pressure in the arteries during the relaxation phase of the heart. The normal value of systolic pressure is 120 mm Hg, while the normal diastolic pressure is 80 mm Hg.

BiologyClass 10ICSE

With which human organ systems (or human systems) are the following associated? (i) vena cava (ii) glomerulus (iii) alveoli (iv) villi

Vena cava - Human circulatory Glomerulus - Human excretory Alveoli - Human respiratory Villi - Human digestive

BiologyClass 10ICSE

What are the various components of blood? State their functions.

Following are the various components of blood: Plasma: Transportation of food, carbon dioxide, wastes and salts is carried by Erythrocytes (RBCs): They carry the oxygen from the lungs to all parts of the Leucocytes (WBCs): They fight infections and protect the body from foreign particles, like germs and bacteria. Platelets: They help in the coagulation of blood by releasi

BiologyClass 10ICSE

What is hypertension? Why is it caused? What harm can it do?

Hypertension is the other name of high blood pressure. High blood pressure is caused when there is constriction in arteries called arterioles. Arterioles regulate the blood flow through our body. As these arterioles constrict, the heart has to work harder to pump the blood through the smaller space. Due to this, the pressure inside the vessels grows. A very high blood pressure can lead to the rupture of artery and internal bleeding.

BiologyClass 10ICSE

(a) What is lymph? State two major functions of lymph. (b) What is meant by saying that the blood pressure of a person is 120/80?

Lymph is a clear, yellowish, slightly alkaline fluid, which contains white blood cells and the fluid resembles to plasma. Functions of lymph: It helps in the defensive mechanism of the body by killing the foreign body with the help of lymphocytes and making antibodies. It transports nutrients from the tissue cells to the blood, through lymphatic A reading of 120/80 means that the person has a normal blood

BiologyClass 10ICSE

(a) What are the methods used by plants to get rid of their waste products? (b) How are waste products excreted in Amoeba?

Plants to get rid of their waste products by the following methods: The gaseous wastes are removed through stomata in leaves and lenticels in Some of the waste products are excreted into the soil around Some of the waste are removed in the form of gum and In amoeba carbon dioxide is excreted by diffusion through the cell membrane, while excess water and nitrogenous waste like ammonia is removed by the contractile vacuole

BiologyClass 10ICSE

(a) What are the upper parts of the heart called? (b) What are the lower parts of the heart called? (c) What is the name of blood vessels which connect arteries to veins? (d) (i) Which side of the heart pumps blood into the lungs? (ii) Which side of the heart pumps blood into the entire body (except the lungs

Capillary tubes connect arteries to (i) The right side of the heart pumps blood into the (ii) The left side of the heart pumps blood to the entire body, except the lungs.

BiologyClass 10ICSE

State the differences between artery, vein and capillary.

Arteries Veins Capillaries These are tough, thick and comprises of elastic tubes. Veins are thin-walled and comprises of non-elastic tubes. Capillaries are very thin-walled tubes. They contain a narrow lumen. <

BiologyClass 10ICSE

A dialysis machine contains long tubes coiled in a tank containing dialyzing solution: (i) Of what substance are the tubes made? (ii) What does the dialyzing solution contain? (iii) Name the main waste which passes into the dialyzing solution.

The tubes, which are selectively permeable These are made up of cellulose. The dialyzing machine contains water, glucose and The concentration of these components are similar to the components present in the blood. Urea is the main waste that passes into the dialyzing

BiologyClass 10ICSE

(a) How many types of blood vessels are there in the human body? Name them. (b) Why does the heart need valves?

(a) There are three types of blood vessels in the human body namely, arteries, veins and capillaries. (b) The heart needs valves to regulate the flow of blood. It helps in the movement of blood in a single direction.

BiologyClass 10ICSE

What is the liquid part of the blood called? What is the function of platelets in the blood?

Plasma is the liquid part of blood. The main function of the platelets is the clotting of blood. They contain essential chemicals that help in the excessive bleeding.

BiologyClass 10ICSE

Why do some people need to use a dialysis machine? What does the machine do?

Kidneys help in the removal of major waste products like ammonia and urea. These are excreted regularly from our body with the help of kidneys. In the case of kidney failure, these wastes are not excreted and can cause harmful effects to the body. Then the blood is filtered externally by the process of dialysis. In this process the blood is purified externally. The impure blood is taken out of the body. Then in the dialysis machine it is purified and the pureblood is sent back to the

BiologyClass 10ICSE

(a) What job is done by the kidneys? (b) What do kidneys excrete? (c) What is the name of the tubes which connect the kidneys to bladder? (d) What does the bladder in our body do?

Kidneys filter the wastes out of the blood and form the They also help in maintaining the water balance in the body. Kidneys remove urea, other soluble salts and excess water from the These are removed from the blood in the form of urine. The tubes that connect kidneys to bladder are known as The urinary bladder helps in storing the urine until it is forced out of the body through an opening known as the urethra.

BiologyClass 10ICSE

Define excretion. Name the excretory unit of a kidney.

Excretion is the process of removal of waste products from the body. Nephrons are the excretory unit in kidney.

BiologyClass 10ICSE

Match the terms in Column I with their uses in column II Column I Column II (i) Heart (a) Pipes for transport in humans (ii) Arteries and Veins (b) Clotting of blood (iii) Xylem vessels (c) Pumping organ (iv) RBC (d) Water transport in plants (v) Platelets (e) Carrier of oxygen

(i) Heart - Pumping organ (ii) Arteries and Veins &ndash; Pipes for transport in humans (iii) Xylem vessels &ndash; Water transport (iv) RBC &ndash; Carrier of oxygen (v) Platelets &ndash; Clotting of blood

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