Cardiovascular System
These blood vessels carry rich-oxygen blood away from the heart.
What are arteries?
This organ connects to the small intestine via the common bile duct and produces bile to help digest fats.
What is the liver?
This is the primary function of the respiratory system, allowing the body to take in oxygen and remove carbon dioxide.
What is gas exchange?
These cells transmit electrical signals throughout the body.
What are neurons?
These tiny swimmers are produced in the testes and have one mission: reach the egg.
What are sperm?
These tiny blood vessels are the site where gases, nutrients, and wastes are exchanged with body tissues.
What are capillaries?
This is the physical breakdown of food into smaller pieces. It starts in the mouth with chewing and mixing with saliva, continues in the stomach with churning, and produces a soft mass called a bolus, making it easier to swallow and for enzymes to act.
What is mechanical digestion ?
This structure in the throat covers the trachea during swallowing to prevent food from entering the lungs.
What is the epiglottis?
This type of neuron carries impulses from sensory receptors to the central nervous system.
What is a sensory (afferent) neuron?
This hormone is basically the "male pep talk", responsible for muscle growth, deep voice, and that infamous hair pattern.
What are testosterone?
This valve prevents blood from flowing backward from the left ventricle into the left atrium.
What is the mitral (bicuspid) valve?
This part of the digestive system is the primary site of nutrient absorption and receives secretions from the pancreas and liver.
What is the small intestine?
These tiny sacs in the lungs are the site of oxygen and carbon dioxide exchange with the blood.
What are alveoli?
This part of the central nervous system is protected by cerebrospinal fluid and acts as a highway for signals between the brain and body.
What is the spinal cord?
This organ is a cozy, muscular home where a fertilized egg can grow into a baby.
What is the uterus?
This electrical structure of the heart is known as the natural pacemaker that initiates each heartbeat.
What is the sinoatrial (SA) node?
This enzyme, produced in the small intestine, is missing in people who are lactose intolerant.
What is lactase?
This dome-shaped muscle contracts during inspiration, increasing the volume of the thoracic cavity to draw air into the lungs.
What is the diaphragm?
This brain region coordinates voluntary movement, balance, and posture.
What is the cerebellum?
Every month, this lining gets ready to redesign for the uterus to host a baby, but if nothing shows up, it sheds.
What is the endometrium?
This heart sound occurs when the atrioventricular valves close at the beginning of ventricular contraction.
What is the “lub” sound (S1)?
This organ produces digestive enzymes like amylase, lipase, and proteases, which are delivered to the small intestine.
What is the pancreas?
This condition involves the destruction of alveoli, reduced elasticity of the lungs, and difficulty exhaling, often caused by smoking.
What is emphysema?
This division of the autonomic nervous system activates the “fight-or-flight” response, while its counterpart promotes “rest-and-digest” activities.
What is the sympathetic nervous system (and parasympathetic nervous system)?
Known as the "baby hotel", this organ provides oxygen, nutrients, and waste removal, basically a five star resort for 9 months.
What is the placenta?