Unit 2 Lesson 2

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Body systems & Levels of Organization 7th grade science

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34 Terms

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Mechanical Input
signals that enter the body through physical touch or vibration
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Messages
are received, processed, and a response is sent out
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Behavior
what a plant or animal does
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Response
what your body does in reaction to a stimulus
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Organ
structure that is made up of different kinds of tissue
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Absorption
process by which nutrients move from the digestive system into the bloodstream, to be delivered to all cells by the circulatory system
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Chemical Input
a chemical that enters the body
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Nerve Cell
Also called a neuron. It is also cells that carry information through your nervous system
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circulatory system
When oxygen moves into the bloodstream this system delivers it to all the cells and carries back carbon dioxide to be expelled
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Respiratory system
moves oxygen into the body and carbon dioxide out of the body
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Stimulus
a signal in the environment that makes you react
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Respiratory and circulatory system
The oxygen brought in by these systems are used to release energy from sugar in your food
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Circulatory system
brings materials such as oxygen to all cells and takes away waste from those cells such as carbon dioxide
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Tissue
group of similar cells that perform the same function
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Examples of tissue
nervous, epithelial, muscle, connective
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Examples of organs
heart, brain, lungs, and skin
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Organ Systems
a group of organs that work together, carrying out major functions
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Examples of organ systems
Muscular System, Nervous Systems
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Organism
any living thing
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Examples of chemical input
smelling or tasting something
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Examples of mechanical input
touching or hearing something
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Electromagnetic input
signals that enter the body in the form of electromagnetic stimuli
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Examples of electromagentic input
seeing something
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Sensory Receptors
a nerve ending that sends signals to the central nervous system when it is stimulated
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Brain
organ that serves as the primary control center of the nervous system
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Least complex - most complex
Cells - tissue - organs - organ systems - organism
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Levels of Organization
A group of specialized cells build tissue
A group of tissue builds an organ
A group of organs build an organ system
A group of organ systems build an organism
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Nervous system
tells your muscles when and how to act and controls movement
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Skeletal system
when muscles are told to move they pull on the bones of this system to allow for movement
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Central Nervous System
consists of your Brain and Spinal cord
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Peripheral Nervous System
consists of nerves
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Multicellular organism
all the organ systems work together
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Excretory system
eliminates waste from the body
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Digestive system
the circulatory system works with this system to get nutrients to all body cells