Excretory System

Question 1

Metabolic Wastes

Answer 1

a product of a cell’s metabolism (chemical reactions) that is either harmful to the cell or the cell cannot use

Question 2

Excretion

Answer 2

removal of wastes from an organism

Question 3

Purpose of excretion

Answer 3

to get rid of metabolic wastes to maintain homeostasis

Question 4

Parts of the urinary system

Answer 4

kidney, ureter, urinary bladder, urethra

Question 5

Function of Kidney

Answer 5

to filter wastes from the blood and then produce urine, regulates water and salt balance

Question 6

Function of Ureter

Answer 6

to transport urine from the kidneys to the urinary bladder

Question 7

Function of Urinary Bladder

Answer 7

to store urine

Question 8

Function of Urethra

Answer 8

to release urine

Question 9

What are the organs of excretion?

Answer 9

skin, lungs, liver, and the entire urinary system

Question 10

How does the skin contribute to excretion?

Answer 10

excretes sweat which contains water, salts, and small amounts of urea

Question 11

How do the lungs contribute to excretion?

Answer 11

Removal of carbon dioxide from the body (and small amounts of water vapor) through exhaling

Question 12

How does the liver contribute to excretion?

Answer 12

converts toxic substances into that aren’t as harmful (and makes bile)

(ex. ammonia to urea)

Question 13

nephron

Answer 13

one of millions of tubes and its associated blood vessels in the kidneys that extract materials from the blood and refine it into urine

Question 14

glomerulus

Answer 14

ball of capillaries sitting in the cup-shaped structure of the nephron called Bowman’s capsule

Question 15

Bowman’s capsule

Answer 15

cup-shaped structure in the upper end of a nephron that encases the glomerulus

Question 16

How is the circulatory system related to the excretory system?

Answer 16

the kidney filters blood that goes through the capillaries and gets rid of the waste and reabsorbs the necessary substances

Question 17

Three steps of formation of urine

Answer 17

filtration, reabsorption, excretion

Question 18

Filtration

Answer 18

blood pressure forces water, small solutes, glucose, amino acids and urea into Bowman’s capsule. This creates the filtrate.

Question 19

Reabsorption

Answer 19

water, nutrients and some salts are returned to blood from the filtrate

Question 20

Complete Reabsorption

Answer 20

return glucose and amino acids to blood

Question 21

Selective Reabsorption

Answer 21

balance water and salt (homeostasis)

Question 22

Excretion (part of urine formation)

Answer 22

remaining is urine and is transported to the bladder and eventually leaves the body through the urethra

Question 23

What parts of the formation of urine is the kidney apart of?

Answer 23

filtration and reabsorption