Heart
This muscular chamber of the heart has the thickest walls because it must pump blood to the entire body.
What is the Left Ventricle?
This flap of tissue covers the windpipe during swallowing to prevent food from entering the lungs.
What is the Epiglottis?
This type of connective tissue connects a muscle to a bone.
what is a tendon?
This part of the neuron receives incoming signals from other nerve cells.
What are Dendrites?
These blood vessels carry oxygen-rich blood away from the heart.
What are Arteries?
Most nutrient absorption happens in this organ, which is lined with tiny finger-like villi.
What is the Small Intestine?
These are the three types of muscle tissue found in the human body.
What are Skeletal, Smooth, and Cardiac?
This division of the nervous system is responsible for the "Fight or Flight" response.
What is the Sympathetic Nervous System?
The "lub-dub" sound of a heartbeat is actually the sound of these structures closing to prevent backflow.
What are Heart Valves?
These tiny air sacs in the lungs are the site where oxygen enters the blood and carbon dioxide leaves it.
What are Alveoli?
This tough, flexible tissue acts as a cushion between bones at a joint.
What is Cartilage?
These specific white blood cells produce antibodies to fight off pathogens.
What are B-Cells?
This is the only artery in the body that carries deoxygenated blood (moving it from the heart to the lungs).
What is the Pulmonary Artery?
This large, flat muscle at the base of the chest contracts and moves downward to help you inhale.
What is the Diaphragm?
This type of connective tissue connects one bone to another bone.
What is a Ligament?
This is the insulating layer (fatty sheath) that wraps around an axon to speed up electrical signals.
What is the Myelin Sheath?
These are the smallest blood vessels where the actual exchange of gases and nutrients occurs.
What are Capillaries?
This accessory organ produces bile, which helps break down fats during digestion.
What is the Liver?
New blood cells are produced in this part of the bone.
What is the Red Bone Marrow?
This type of immunity is what you develop after receiving a vaccine or recovering from an illness.
What is Active (or Adaptive) Immunity?