Ch. 25 - Animal Systems I

Question 1

digestive tract

Answer 1

• tube that begins at the mouth and ends at the anus

Question 2

rumen

Answer 2

• stomach chamber in cows and related animals in which symbiotic bacteria digest cellulose

Question 3

gill

Answer 3

• feathery structure specialized for the exchange of gases with water

Question 4

lung

Answer 4

• respiratory organ; place where gases are exchanged between the blood and inhaled air

Question 5

alveolus (alveoli)

Answer 5

• one of many tiny sacs at the end of a bronchiole in the lungs that provide surface area for gas exchange to occur

Question 6

heart

Answer 6

• hollow muscular organ that pumps blood throughout the body

Question 7

open circulatory system

Answer 7

• type of circulatory system in which blood is only partially contained within a system of blood vessels as it travels through the body

Question 8

closed circulatory system

Answer 8

• type of circulatory system in which blood circulates entirely within blood vessels that extend throughout the body

Question 9

atrium (pl, atria)

Answer 9

• upper chamber of the heart that receives blood from the rest of the body

Question 10

ventricle

Answer 10

• lower chamber of the heart that pumps blood out of heart to the rest of the body

Question 11

excretion

Answer 11

• process by which metabolic wastes are eliminated from the body

Question 12

kidney

Answer 12

• an organ of excretion that separates wastes and excess water from the blood

Question 13

nephridium

Answer 13

• excretory structure of an annelid that filters body fluid

Question 14

Malpighian tubule

Answer 14

• structure in most terrestrial arthropods that concentrates the uric acid and adds it to digestive wastes