Excretion (chpt. 31)

Question 1

Excretion

Answer 1

The removal of metabolic waste from the body

Question 2

Excretory organ in plants

Answer 2

Leaves - through stomata

Question 3

Vasoconstriction

Answer 3

When we are COLD, blood vessels contract and reduce blood flow to capillaries near the surface

Question 4

Vasodilation

Answer 4

When we are WARM, blood vessels dilate and increase blood flow near the surface of the skin to increase heat loss

Question 5

Role of the skin

Answer 5

• Protection (epidermis, melanin, sebum)
• Vitamin Production (vitamin D)
• Food store (fat)
• Sense organ (touch, pain, temperature)
• Excretion (sweat)
• Temperature regulation

Question 6

Excretory organs in humans

Answer 6

Skin
Lungs
Kidneys

Question 7

What is excreted by the lungs

Answer 7

Carbon dioxide

Question 8

What is excreted by the skin

Answer 8

Sweat (water, salts, urea)

Question 9

Where are the kidneys located in an adult human

Answer 9

Lower abdomen

Question 10

Location of filtration in the nephron

Answer 10

Bowman’s capsule

Question 11

Location of re absorption in the nephron

Answer 11

Proximal convoluted tubule

(Or DCT , loop of Henle)

Question 12

Name the arteriole that enters bowman’s capsule

Answer 12

Afferent arteriole

Question 13

Structural differences between Afferent and Efferent arteriole & significance of difference

Answer 13

Efferent has a narrow lumen, increases blood pressure

Question 14

Why would prolonged strenuous exercise lead to production of ADH

Answer 14

Low water content in blood

Question 15

What part of the nephron is influenced by ADH

Answer 15

Collecting duct

Question 16

Explain the importance of blood entering the glomerulus under pressure

Answer 16

Force filtered

Question 17

Two reasons why capillaries surround PCT, loop of Henle, DCT

Answer 17

Reabsorption & secretion

Question 18

Is it normal for proteins to be found in urine? Why / why not?

Answer 18

No - protein molecules too big to pass into filtrate

Question 19

Is it normal for glucose to be found in urine? Why / why not?

Answer 19

No - glucose in filtrate should have been reabsorbed

Question 20

Function of the sweat gland

Answer 20

Temperature regulation

Question 21

From which germ layer is skin produced

Answer 21

Ectoderm

Question 22

Identify the non-living layer present in skin

Answer 22

Epidermis

Question 23

Name two structures in the skin that play a role in temperature regulation

Answer 23

Sweat gland
Hair

Question 24

What term is used to describe organisms that can regulate their body temperature

Answer 24

Endotherm