What is the main function of red blood cells?

Which blood vessels have valves to prevent backflow?

What component of blood is responsible for clotting?

Which chamber receives deoxygenated blood from the body?

What protein in red blood cells binds to oxygen?

Which blood vessels are the site of nutrient and gas exchange?

Which part of the circulatory system carries oxygenated blood from the lungs to the heart?

Which organ mechanically and chemically digests food?

Which structure prevents food from entering the trachea during swallowing?

Which organ produces digestive enzymes and hormones like insulin?

Which part of the digestive system absorbs water and forms feces?

Which nutrient does bile help to break down?

What is peristalsis?

Which carbohydrate is broken down by amylase?

Which part of the nephron filters blood?

Which blood vessel brings blood to the kidney?

Which structure stores urine before it is excreted?

Which hormone regulates water reabsorption in the kidney?

What does the Loop of Henle primarily regulate?

Which structure carries urine to the outside of the body?

Which mineral is most important for strong bones?

Which connective tissue cushions joints?

Which muscle type is involuntary and non-striated?

Which part of the skeleton protects the brain?

Which of the following connects bone to bone?

Which type of joint allows the widest range of motion (e.g., shoulder)?

What structure prevents food from entering the lungs?

Which gas is required for cellular respiration?

What gas is exhaled as a waste product of respiration?

Which structures branch into smaller tubes inside the lungs?

The process of moving air in and out of the lungs is called:

What surrounds alveoli to allow gas exchange?

Which type of white blood cell engulfs pathogens?

HIV primarily attacks which cells?

Which part of the immune system is the first line of defense?

Which is an example of passive immunity?

Which organ produces T-cells?

What is inflammation a sign of?

Which gland controls metabolism by producing thyroxine?

Which gland produces adrenaline (epinephrine)?

Which gland regulates blood calcium levels?

Which hormone regulates sleep cycles?

Which gland is known as the "master gland"?

What is the basic unit of the nervous system?

Which part of the brain controls balance and coordination?

Which part of a neuron receives signals?

What carries signals across a synapse?

Which part of the nervous system controls involuntary actions like heartbeat?

The spinal cord is part of the: