Respiratory & Circulatory System

Which of the following are the blood vessels that have a wall that is 1 cell thick?

• Veins

• Arteries

• Capillaries

What is the role of the respiratory system?

• Add CO2
• Remove O2 
• Add CO2 and remove O2
• Add O2 and remove CO2 

The air sacs that are covered with capillaries where gas exchange takes place

• bronchi
• lungs
• oxygen
• alveoli

Breathing out; exhalation of breath.

• Inspiration

• Expiration

The drawing in of breath; inhalation.

• Inspiration

• Expiration

What is the site of gas exchange?

• alveoli

• nose

• lung

• bronchi

A capillary is a form of...

• Gas exchange

• Respiration

• Blood vessel

• Alveoli

Oxygen + haemoglobin = ?

• oxygenated haemoglobin
• oxyhaemoglobin
• haemoglobin
• oxygenglobin

Diffusion is...

• Movement of gas from an area of high concentration to high

• Movement of gas from an area of high concentration to low

• Movement of gas from an area of low concentration to high

• Movement of gas from an area of low concentration to low

When the diapragm relaxes and moves back up, the lungs are...

• expanding with air
• shrinking - pushing air out