Respiratory and Circulatory System Worksheet

Which structure prevents food from entering your lungs when you swallow?

• Epiglottis

• Trachea

• Esophagus

• Larynx

Which structure, also known as the windpipe, is the main passageway to your lungs?

• Trachea

• Esophagus

• Bronchi

• Larynx

Which of the following sequences correctly represents the pathway of air as it travels through the respiratory structures?

• Nose/Mouth → Pharynx → Larynx → Trachea → Bronchi → Lungs

• Nose/Mouth → Larynx → Pharynx → Trachea → Bronchi → Lungs

• Nose/Mouth → Trachea → Pharynx → Larynx → Bronchi → Lungs

• Nose/Mouth → Bronchi → Trachea → Larynx → Pharynx → Lungs

The act of breathing is done by the actions of what? ________

• Diaphragm and rib muscles

• Heart and arteries

• Stomach and intestines

• Liver and kidneys

What is the purpose of valves? ________

• To prevent the backflow of blood in the heart and veins

• To increase the speed of blood flow

• To produce red blood cells

• To absorb oxygen from the lungs

Most blood cells are formed in the: ________

• Bone marrow

• Liver

• Heart

• Lungs

Which cellular structure is missing in red blood cells? ________

• Nucleus

• Mitochondria

• Cell membrane

• Cytoplasm

Which component of blood provides defense against foreign substances? ________

• White blood cells

• Red blood cells

• Platelets

• Plasma

What is the fluid portion of blood that makes up 55% of total blood?

• Plasma

• Red blood cells

• White blood cells

• Platelets

This is what makes your red blood cells appear red: __________

• Hemoglobin

• Chlorophyll

• Keratin

• Insulin