BIO 2 GAS EXCHANGE IN HUMANS 1

Question 1

is a group of organs that facilitate the
movement and interchange of oxygen and
carbon dioxide within the body.

Answer 1

THE RESPIRATORY SYSTEM

Question 2

exchange of gases with the
external environment
occurs in the alveoli of the
lungs

Answer 2

EXTERNAL RESPIRATION

Question 3

exchange of gases with the
internal environment
occurs in the tissues

Answer 3

INTERNAL RESPIRATION

Question 4

A bony and cartilaginous structure. Warms, conditions, and filters the air you
breathe
The entrance to your respiratory system.
Filters and cleans air to remove germs and
allergens.

Answer 4

NOSE

Question 5

The space inside of the
nose.
Filters and warms the air
before it goes into the
lungs.
It is divided into two
sections called NASAL
PASSAGES

Answer 5

NASAL CAVITY

Question 6

the opening at the
back of the nasal cavity leading into
the throat.

Answer 6

POSTERIOR NARES

Question 7

Separated by the NASAL
SEPTUM, the wall divides the
nasal cavity into two sections.

Answer 7

ANTERIOR NARES

Question 8

Serves as an alternate
entryway for air.
Can humidify and warm
inhaled air, though less
efficiently than the nasal
cavity.

Answer 8

ORAL CAVITY

Question 9

Air-filled cavities within the skull.
Help humidify inhaled air.
May also contribute to the resonance of speech.

Answer 9

SINUSES

Question 10

Also known as the “Throat”.
Connects the nasal cavity to the larynx.
Contains tonsils, which play a role in the
immune system, by filtering out harmful
substances and trapping and killing germs.

Answer 10

PHARYNX

Question 11

A flap of cartilage that covers
the larynx during swallowing.
Directs food and liquids into the
esophagus.

Answer 11

EPIGLOTTIS

Question 12

Also known as the “Voice Box”.
Connects the pharynx to the
trachea.
Contains the vocal cords, which
vibrate to produce sound.

Answer 12

LARYNX

Question 13

Also known as the
“Windpipe”
A tube that carries air to
the lungs.
Lined with cilia and mucus
to trap and remove debris.

Answer 13

TRACHEA

Question 14

Main organs of respiration.
Responsible for gas
exchange between air and
blood.
Paired organs that are
located in the thoracic
cavity.

Answer 14

LUNGS

Question 15

Large airways that branch
from the trachea.
One bronchus enters each
lung, and further branching
forms smaller bronchi.

Answer 15

BRONCHI

Question 16

Smaller airways that
branch from the bronchi.
Smooth muscle in their
walls can constrict or
dilate, affecting airflow.
Lead to the alveoli.

Answer 16

BRONCHIOLES

Question 17

Tiny air sacs at the end of
the bronchioles.
Sites of gas exchange
between air and blood.

Answer 17

ALVEOLI

Question 18

A dome-shaped muscle
located below the lungs.
The primary muscle of
inhalation.

Answer 18

DIAPHRAGM

Question 19

During Inhalation

Answer 19

Nice Mice Prefer Long
Tunnels, Leading Below
Bright Arches.

Question 20

Responsible for pumping blood between the heart and lungs, forming a closed circuit between it.

Answer 20

Pulmonary Circulation

Question 21

Located between the ribs, these muscles
assist in the expansion and contraction of
the chest.

Answer 21

INTERCOSTAL MUSCLE

Question 22

contracts and moves downward,
increasing the space in the thoracic cavity (a hollow space in the chest that contains the heart, lungs, and other vital organs. It’s also known as the chest cavity.)

Answer 22

DIAPHRAGM CONTRACTION

Question 23

These muscles contract, pulling the ribs
upward and outward, expanding the chest.

Answer 23

EXTERNAL INTERCOSAL MUSCLE CONTRACTION

Question 24

The volume of the chest cavity increases, which decreases the pressure inside the lungs (according to Boyle’s Law).

Answer 24

DECREASE IN PRESSURE

Question 25

The ___ detects CO2 levels in the blood and sends signals to increase or decrease the rate of breathing to maintain homeostasis.

Answer 25

medulla