Respiratory System

Why did early life forms need a circulatory system and respiratory system?

• To move bulk amounts of oxygen around their bodies

• To extract oxygen from water through diffusion

• To evolve into vertebrates

• To survive in water

How do humans move gases between air and cell membranes?

• Gills

• Lungs

• Fins

• Trachea

What is the purpose of the conducting zone in the respiratory system?

• To warm and moisten incoming air

• To filter out dust and particles

• To facilitate gas exchange

• To protect the lungs

What is the function of the epiglottis?

• To direct food and liquids to the lungs

• To warm and moisten incoming air

• To filter out dust and particles

• To prevent food and liquids from entering the lungs

Why does the trachea have prominent rings?

• To keep it open and prevent collapse

• To facilitate gas exchange

• To filter out dust and particles

• To warm and moisten incoming air

Where does gas exchange occur in the respiratory system?

• Alveolar sacs

• Bronchioles

• Trachea

• Sinuses

How do oxygen molecules enter the bloodstream from the alveoli?

• Through the alveolar sacs

• Through the bronchioles

• Through the trachea

• Through the capillaries

What is the purpose of bulk flow in respiration?

• To move large numbers of molecules quickly

• To facilitate diffusion of oxygen

• To filter out dust and particles

• To warm and moisten incoming air

What is the role of hemoglobin in respiration?

• Hemoglobin is responsible for the excretion of waste in fish.

• Hemoglobin aids in the digestion of food in fish.

• Hemoglobin carries oxygen from the gills to the body tissues.

• Hemoglobin helps fish maintain their body temperature.

Where does gas exchange take place in the respiratory system?

• pharynx

• alveoli

• trachea

• bronchi