They connect arteries and veins

• circulatory system

• The lungs

• The heart

• The capillaries

Which is the correct pathway that blood takes as it leaves the heart, circulates throughout the body, and returns to the heart?

• arterioles, arteries, venules, veins, capillaries
• veins, venules, capillaries, arteries, arterioles
• arterioles, arteries, capillaries, veins, venules
• arteries, arterioles, capillaries, venules, veins

This is an image of the alveoli in the lungs.

• True
• False

The function of the respiratory systems is to bring carbon dioxide into the body and to expel oxygen and water vapor.

• True
• False

Which is the correct pathway of air into the respiratory system?

• nose and mouth, pharynx, trachea, bronchi, bronchioles, alveoli
• nose and mouth, bronchi, trachea, pharynx, bronchioles, alveoli
• alveoli, bronchioles, bronchi, trachea, pharynx, nose and mouth
• pharynx, nose and mouth, bronchioles, bronchi, trachea, alveoli

In which structure of the respiratory system does gas exchange take place?

• trachea
• bronchioles
• pharynx
• alveoli

Which is the correct sequence of blood flow through the heart and lungs?

• left ventricle, left atrium, lungs, right ventricle, right atrium
• right atrium, right ventricle, lungs, left atrium left ventricle
• lungs, right atrium, right ventricle, left atrium, left ventricle
• right atrium, right ventricle, left atrium, left ventricle, lungs

When you breathe, your lungs take in ___ and remove ___.

• air, oxygen

• oxygen, carbon dioxide

• carbon dioxide, waste

• waste, air

Red blood cells hold onto O₂ with the protein ________ which needs the element ________.

• hemoglobin, phosphorus

• hemoglobin, iron

• myoglobin, phosphorus

• myoglobin, iron

This part of blood helps it clot, when you get cut.

• Red blood cells
• Plasma
• Platelets
• White blood cells