3.2 the kidneys and homeostasis

5/26/2018 3.2 the Kidneys and Homeostasis

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3.2 The Kidneys and Homeostasis

Use these terms to fill in the gaps. All words will be used once only.

ADH Molecules Toic !i"er #roteins

Urine Ureter $tored %lood Tubules

$electi"e &lucose 'cretory (eabsorbed Urea

)iltering )ood )iltrate )iltration #roteins

Acti"e transport *ater +smosis Tubes !arge

Water and salt enter the body mainly in .. and drinks. The kidneys are the

organs involved in controlling the amount of water and salt and removi

urea (which is to humans) out of the blood. Urea is produced in the

from the breakdown of the.. acids from excess proteinsin our dietwhich t

body is unable to store.

The regulation and removal of these substances in the .. stream is carried

out by millions of tiny . called kidney .. or nephrons. The

work by out of the blood small ...................... such as water glucose

salt (as ions) and ... via diffusion and in the case of water by . .

this li"uid called flows through the tubules all of the ....

is reabsorbed back into the blood by .. as is some of the

.. and salt. !s the "uantities of water and salt ions that are reabsorb

varied it is called . reabsorption. ! very small amount of the urea i

also .... into the blood down its concentration gradient.

The blood also contains other components such as . and blood cells b

because of their .. si#e they remain in the blood at the initial

.. stage unlike the smaller molecules mentioned earlier. The amount o

water reabsorbed back into the blood is controlled by a hormone called

(anti$diuretic hormone).

These substances the water salts and urea now form the li"uid we call ....

This travels down two tubes called the ... and into the muscular bladder

where it is . before it leaves the body via the urethra.


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3.2 The Kidneys and Homeostasis

Use these terms to fill in the gaps. All words will be used once only.

ADH Molecules Toic !i"er #roteins

Urine Ureter $tored %lood Tubules

$electi"e &lucose 'cretory (eabsorbed Urea

)iltering )ood )iltrate )iltration AminoActi"e transport *ater +smosis Tubes !arge

Water and salt enter the body mainly in foodand drinks. The kidneys are the

excretoryorgans involved in controlling the amount of water and salt and removing

urea (which is toxicto humans) out of the blood. Urea is produced in the liver from

the breakdown of theaminoacids from excess proteinsin our dietwhich the body i

unable to store.

The regulation and removal of these substances in the bloodstream is carried out b

millions of tiny tubescalled kidney tubulesor nephrons. These work by filteringout

the blood small molecules such as water glucose salt (as ions) and ureavia diffus

and in the case of water by osmosis. !s this li"uid called filtrate flows through th

tubules all of the glucoseis reabsorbed back into the blood by active transport as

some of the water and salt. !s the "uantities of water and salt ions that are

reabsorbed varied it is called selective reabsorption. ! very small amount of the uis also reabsorbedinto the blood down its concentration gradient.

The blood also contains other components such as proteins and blood cells but

because of their large si#e they remain in the blood at the initial filtration stage

unlike the smaller molecules mentioned earlier. The amount of water reabsorbed ba

into the blood is controlled by a hormone called !%&(anti$diuretic hormone).

These substances the water salts and urea now form the li"uid we call urine. This

travels down two tubes called the ureter and into the muscular bladder where it is

storedbefore it leaves the body via the urethra.


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3.2 the kidneys and homeostasis

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