Digestive System
Where digestion starts
What is the mouth?
Substance excreted by the lungs
What is carbon dioxide
The brain and spinal cord
What is the central nervous system?
Chemical message released into the bloodstream
What is a hormone?
The 3 types of muscles
What are skeletal, smooth, cardiac?
Proteins, lipids, and carbohydrates
What are nutrients?
Organs that filter blood and remove nitrogen waste to form urine
What are kidneys?
The main cells of the nervous system, specialized to send, process, receive messages.
What are neurons?
Organs that produce and release hormones
What are glands?
Large muscle under lungs that contracts and relaxes to allow for inhalation and exhalation
What is the diaphragm?
Muscular pouch that churns food and secretes acid to start digesting proteins
What is the stomach?
Stores urine until excretion.
What is the bladder?
Long extension of a neuron, sends signals away from the cell body
What is an axon?
Master endocrine gland, controls the others
What is the pituitary?
Where blood cells are made?
What is bone marrow?
Proteins that speed up chemical reactions. In the digestive system they help break down food.
What are enzymes?
Tubes that carry urine from the kidneys to the bladder.
What are ureters?
Neurons that receive stimuli from the environment and send impulses to the central nervous system
What are sensory neurons?
Feedback mechanism that stops production of a hormone once levels return to a set point.
What is negative feedback?
Small "balloons" at the end of bronchioles in the lungs; where gas exchange between the air and capillaries takes place.
Structures in the small intestine that absorb nutrients into the blood stream
What are villi?
What are nephrons?
Chemicals released by vesicles at the synapse, bind to receptors on the next cell.
What are neurotransmitters?
Feedback mechanism in which production of the hormone increases
What is positive feedback?
Name 3 accessory organs of the digestive system; food DOES NOT pass through these
What is the Liver, pancreas, gall bladder, salivary glands?