Respiratory System

Question 1

cellular respiration happens where?

Answer 1

In mitochondria

Question 2

food molecules break down in the presence of _

Answer 2

O2

Question 3

release of energy from the breakdown of food, this makes _

Answer 3

ATP

Question 4

Human resp. sys. consists of… 6 things

Answer 4

nose, pharynx, larynx, trachea, lungs, bronchi

Question 5

air moves through… 3 things

Answer 5

nose, pharynx, trachea

Question 6

_ covers the entrance to the trachea when you swallow

Answer 6

epiglottis

Question 7

to keep lung tissues healthy, air must be ,, & _.

Answer 7

warmed, moistened, & filtered

Question 8

large dust particles are ceased by…

Answer 8

nose hairs lining nasal cavity

Question 9

some cells lining the RS produe a thin layer of…

Answer 9

mucus

Question 10

moisten the air & traps inhaled particles

Answer 10

mucus

Question 11

_ sweep the paticles & mucus towards the pharynx

Answer 11

cilia

Question 12

either swallowed or spit out

Answer 12

cilia

Question 13

top of trachea

Answer 13

larynx

Question 14

contains 2 highly elastic folds of tissue known as the vocal chords

Answer 14

larynx

Question 15

_ pull the vocal cords together

Answer 15

muscles

Question 16

From the trachea, air flows into 2 large passageways in the chest cavity called _

Answer 16

bronchi

Question 17

each broncus leads into…

Answer 17

one of the lungs

Question 18

each bronchus subdivides into …

Answer 18

smaller bronchi

Question 19

the smaller bronchi lead to even smaller passageways called _

Answer 19

bronchioles

Question 20

bronchi & bronchioles surrounded by smooth muscle that: 2 things..

Answer 20

helps support them, & enables the ANS (autonomic nervous system) to regulate the size of passageways

Question 21

the bronchioles continue to subdivide, eventually reach dead ends-millions of tiny air sacs called _

Answer 21

alveoli

Question 22

each alveolus is surrounded by a network of…

Answer 22

thin-walled capillaries

Question 23

how many alveoli in each lung?

Answer 23

150 million

Question 24

O2 dissolves in the moisture & then diffuses across the _ in the blood

Answer 24

capillaries

Question 25

_ in the bloodstream diffuses in the opposite direction

Answer 25

CO2

Question 26

Air inhaled contains: _% O2, & _% cO2

Answer 26

21 % O2, .04% CO2

Question 27

Air exhaled contains: _% O2, & _% cO2

Answer 27

less than 15% O2, 4 % CO2

Question 28

no _ connected to the lungs

Answer 28

muscles

Question 29

force that drives air into lungs comes from:

Answer 29

ordinary air pressure

Question 30

during inhalation, rib cage _, the diaphragm _, increasing the size of the chest cavity

Answer 30

rib cage rises, diaphragm contracts

Question 31

inhaling causes the pressure inside the lung to _, and air enters

Answer 31

decrease

Question 32

When the rib cage lowers and the diaphragm muscles relax: the pressure in the chest cavity becomes greater than _

Answer 32

atmospheric pressure

Question 33

part of the brain that controls breathing:

Answer 33

medulla oblongata

Question 34

cell in its breathing center monitor the amount of _ in the blood

Answer 34

CO2

Question 35

the higher the CO2 level, the stronger the…

Answer 35

impulses

Question 36

as the _ level rises, automatic nerve impulses from the breathing center cause the diaphragm to contract, bringing air into the lungs

Answer 36

CO2