Question

explain the excretory system​

Answer 1

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$\large{ \underline{\tt{Excretion:-}}}$

The removal of harmful and unwanted metabolic wastes and salts from the body is called excretion.

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Human excretory system consists of kidneys, ureters, urinary bladder and urethra.

Every human has two kidneys.

Each kidney is made up of three sections: the renal cortex, the renal medulla and the renal pelvis.

The blood arrives at the kidney via the renal artery, which splits into many afferent arterioles.

These arterioles go to the Bowman's Capsules of nephrons, where the wastes are taken out of the blood by pressure filtration.

Peritubular capillaries also surround the nephron so substances can be taken in and out of the blood.

The renal cortex is the outer layer of the kidney and the medulla is the inner layer of the kidney.

The renal pelvis takes urine away from the kidney via the ureter.

Both of the ureters lead the urine into the body's only urinary bladder, which expands and sends nerve impulses when full.

From there, urine is expelled through the urethra and out of the body.

Answer 2

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$\dag$ Excretory system :

All the organisms (plants and animals) are made up of cells. These cells work all the time for sustaining the life of the organism.Most of the work of the cell is in the form of biochemical reactions which they carry out all the time. The biochemical reactions taking place in the ocells of an organism produce toxic waste (poisonous substances) in the body.The accumulation of toxic substances in the body harms an organism. So, for an organsim to lead a normal life, the toxic substances produced in its body must be removed continuously.Thus, the process of removal of toxic substances from the body of an organism is called "Excretion".

$\dag$ Excretory system in Plants :

Plants malso produce ste products during life processes.They have not any special organs for removal of waste products. They produce Carbon dioxide, water vapour and oxygen as wastes. Carbon dioxide and water are produced as waste during respiration by plants whereas oxygen is produced as well during photosynthesis.

The plants also store some of the waste products in their body parts. For example:- Some of the waste product collect in the leaves, bark, fruits of the plants. The plant get rid of this waste by shedding of leaves, peeling of bark felling of fruits. Plants also excrete some of the wastes into the soil around them.

$\dag$ Excretory system in Humans :

The Excretory system of human beings collected the liquid waste is of the body and help it get rid of them. Excretory system of human beings consists of the following main organs : Two kidneys, Two ureters, Bladder and Urethra. The Kidney are bean shaped organ towards the back of our body (just above the waist). Every person has two Kidneys. The blood is our body is constantly passing through our kidney. The renal artery brings the dirty blood into the kidneys.The function of Kidneys is to remove the poisnous substance urea, other waste salts, excess water from the blood and excrete them in the form ofva yellowish liquid called urine.

Thus, Kidneys clean our blood by filterting it to remove unwanted substances present in. The cleaned blood is carried away from the Kidneys by the renal vein (or kidney vein). The ureters, one from each kidney, opens into urinary bladder. Urine is stored in the bladder. The bladder is a bag with stores urine till the time we go to the toilet. Urethra is a tube. The urine collecting in the bladder is passed out of the body.