Respiratory System

Which structure in humans is lined with ciliated mucous membrane, is supported by cartilaginous rings, and functions as a passageway for air?

• esophagus

• alveolus

• pharynx

• trachea

Which statement best describes the structure indicated by letter X in the diagram below?

• It is kept open by rings of cartilage.

• It is lined with a mucous membrane that filters, moistens, and warms the air.

• It is made up of alveoli.

• It contains ciliated bronchioles to filter the incoming air.

Which statement best describes the function of the respiratory passageways of a human?

• They permit digestive end-products to make contact with body cells.

• They permit exchange between the external atmosphere and the circulatory system.

• They transport gaseous cellular wastes from body cells to the lungs for excretion.

• They regulate the amount of ammonia and salt dissolved in body fluids.

Which statement best describes the human respiratory system?

• It is composed of a network of moist passageways that permit air to flow from the external environment to the lungs.

• Each cell of the human body is in direct contact with the external environment, and gas exchange occurs by diffusion.

• The external body surface is kept moist to allow for gas exchange.

• Gases diffuse across membranes on both the external and internal surfaces of the body.

The cellular process which uses oxygen and sugar to produce energy is called

• photosynthesis

• cell division

• cellular respiration

• DNA replication

What is the main function of gas exchange

• To remove carbon dioxide and supply oxygen to the body

• To remove oxygen from the body

• To supply carbon dioxide and remove oxygen from the body

• To supply water to the body cells

Which structure shown in the diagram below contracts, causing a pressure change in the chest cavity during breathing?

• A

• B

• C

• D

An increase in breathing rate can be triggered by an increase in the

• carbon dioxide content of the blood

• oxygen content of the atmosphere

• number of platelets in the blood

• number of red blood cells

Which part of the human respiratory system is a thin, moist membranous structure where gas exchange occurs?

• trachea

• bronchus

• epiglottis

• alveolus

Which part of the human respiratory system is correctly paired with a description of its structure?

• alveolus – microscopic sac containing rings of cartilage and ciliated membranes

• pharynx – cavity lined with flagellated mucous membranes

• bronchiole – small branching tubule lacking cartilaginous rings

• trachea – thin, moist membrane surrounded by capillaries