The Immune System

Open Ended

Why is the immune system considered essential for human survival?

Multiple Choice

What is the main function of the lymphatic system?

• To maintain fluid balance and transport immune cells

• To pump blood throughout the body

• To digest food and absorb nutrients

• To produce hormones

Multiple Choice

How does the lymphatic system interact with the circulatory system?

• It collects leaked plasma from capillaries and returns it to the heart alongside veins.

• It pumps oxygen directly into the bloodstream.

• It digests nutrients and sends them to the blood.

• It produces red blood cells in the arteries.

Multiple Select

Which of the following are roles of lymph nodes in the lymphatic system?

• Inspecting and filtering lymph fluid

• Mounting an immune response

• Producing digestive enzymes

• Indicating infection when swollen

Fill in the Blanks

Lymph nodes act as

in the lymphatic system, filtering fluid and mounting immune responses if needed.

Open Ended

Why is it important that pathogens in lymph do not enter the bloodstream?

(be thorough in your response)

Multiple Choice

Which organ is responsible for producing lymphocytes and recycling old red blood cells?

• Spleen

• Liver

• Heart

• Kidney

Multiple Choice

Why do we need Mucosa-associated lymphoid tissues (MALT) at entry points to the body?

• MALT is primarily involved in digestion.
• MALT only functions in the bloodstream.
• MALT is only found in the digestive tract

• entry points to the body (like the mouth and nose) are easy targets for pathogens

Fill in the Blanks

Blood contains important immune cells, such as

blood cells.

Open Ended

Explain how the skeletal system supports the immune system.

Multiple Choice

What is the primary function of Langerhans cells found in the skin?

• They are immune cells that help defend against pathogens.

• They produce melanin for skin color.

• They secrete sweat to cool the body.

• They store fat for energy.

Multiple Choice

What is the main function of hormones produced by the endocrine system?

• They act as chemical messengers sent throughout the body

• They provide structural support to cells

• They store energy for the body

• They break down nutrients in the digestive system

Open Ended

How do the different organ systems work together to protect the body from infection?