Lesson 1
Define an organ.
a body structure composed of different types of tissues that work together.
Define a stimulus.
any change or signal in the environment that can make an organism react in some way
What is digestion?
the process by which your body breaks down food into small nutrient molecules
What other two systems does the circulatory system include?
the cardiovascular system and the lymphatic system
What is a neuron/nerve cell?
a cell that carries information through the nervous system
What is an organ system?
a group of organs that work together, performing major functions
What is a response?
an action or change in behavior that occurs as a result of a stimulus.
What are Nutrients?
nutrients are the substances in food that provide the raw materials the body's cells need to carry out all their essential processes
What does Artery do?
it carries blood away from the heart
What is a synapse?
the junction where one neuron can transfer an impulse to another neuron
What is tissue?
What are glands?
organs that produce and release chemicals either through tiny tubes called ducts or directly into the bloodstream
Define a carbohydrate.
an energy-rich compound, such as sugar or starch, that is made of the elements carbon, hydrogen, and oxygen.
What does a vein do?
it carries blood back to the heart
What is the spinal cord?
a thick column of nervous tissue that links the brain to most of the nerves that branch out through the body
How many major organ systems keep the human body running smoothly?
11
What is a hormone?
the chemical produced from the endocrine gland
waves of smooth muscle contractions the move food through the esophagus toward the stomach
Define a capillary.
a tiny vessel where substances are exchanged between the blood and body cells.
What is a reflex?
the involuntary reaction of jumping when you here a loud noise.
What does the circulatory system do?
it carries oxygen rich blood to all the parts of your body.
What is stress?
the reaction of a persons body to potentially threatening, challenging or disturbing events.
Define enzymes
they are proteins the speed up chemical reactions in the body.
a fluid inside the lymphatic system that consists of water, white blood cells, and dissolved materials such as glucose
Define a gland.
an organ that produces and releases chemicals through ducts or into the bloodstream