Chapter 11 Excretion - Tutorial Worksheet

Jurongville Secondary School Secondary 3 Express Biology Tutorial Syllabus 5100 Name: _________________________ (

)

Class: Sec 3___ Chapter 11: 1.

Date: ____________

Excretion

Fill in the blanks with appropriate words. a. Excretion is the _____________ of ___________ products from the body of __________ organisms. Waste products include ___________ formed during metabolic processes in the body, and unwanted and ______________ materials that enter our body fluids. b. Egestion and excretion are not the same process. Egestion is the removal of _______________ matter from the ______________ system. This matter has never entered any ___________ and so is not a ______________ product of _________________.

2.

Which (W to Z) is the main waste product eliminated by each of the excretory organs (a) to (c)? W: Urea

X: Excess water

a. Skin

Y: Carbon dioxide

Z: Excess heat

____________

b. Lungs ____________ c. Kidneys

3.

______________

Match (a) to (f) with one of the terms (U to Z):

U: Ultrafiltration

V: urinary bladder

W: Urethra

X: Nephron

Y: Active transport

a. Structure in kidney that makes urine

_________________

b. Mechanical process involved in urine formation

_________________

c. Muscular bag where urine is stored temporarily

_________________

d. Structure through which urine flows out of kidney

_________________

Z: Ureter

e. Process involved in selective reabsorption of useful materials in kidney tubules ___________________ f.

Tube through which urine is got rid of from the body

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_________________

4.

The table below compares the contents of the blood in the renal artery and the renal vein. Fill in the table using the words “more”, “less” or “same”. Component Urea Oxygen Carbon dioxide Water Amino acids Heat

5.

Blood in renal artery

Blood in renal vein

The volume of urine production varies greatly from day to day. Indicate the effect of factors (a) to (d) on urine production by filling in increase or decrease beside them: a. A hot day

_________________

b. Strenuous exercise

_________________

c. A cold day

_________________

d. Drinking a litre of water

_________________

Structured Questions 6.

The diagram shows the urinary system of humans. a. Name A to D. i. A: ___________________ ii. B: ___________________ iii. C: ___________________ iv. D: ___________________ b. Compare B and C i. With reference to structure. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ii. Composition of fluid passing through them. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ c. i. What flows along D? __________________________________________

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ii. If the water potential of the fluid in C is lower than normal, what would be the change in the volume and concentration of the fluid in D? ____________________________________________________________ ____________________________________________________________ d. How would a high protein diet affect the composition of the fluid in D? _________________________________________________________________ _________________________________________________________________ e. i. Name the organ that is connected to D. ___________________________ ii. What is its function? ___________________________________________________________

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