Human circulatory, nervous, digestive, and respiratory system biology.
Test your knowledge with these top questions!
Which organ produces bile, the fluid that helps digest fats?
The liver makes bile, while the gallbladder stores and concentrates it until it is needed for digestion.
Which tiny air sacs in the lungs perform gas exchange?
Oxygen and carbon dioxide pass between the alveoli and nearby blood capillaries by diffusion.
Which part of a neuron receives signals and passes them to the cell body?
Dendrites act as a neuron's antennae, while the axon carries signals away from the cell body.
Which blood vessels carry blood away from the heart?
Arteries handle high-pressure flow, while veins return blood to the heart under much lower pressure.