Unit 2 Lesson 2
Levels of Organization
A group of specialized cells build tissue
A group of tissues build an organ
A group of organs build an organ system
A group of organ systems build an organism
*Least Complex → Most Complex
*Cells → Tissues → Organs → Organ System → Organism
Tissues
Tissue - group of similar cells that perform the same function
*example: nervous, epithelial, muscle, connective
N.E.M.C
Organs
Organ - structure that is made up of different kinds of tissue.
Examples: heart, brain, lungs, and skin
H.B.L.S
Organ Systems
Organ Systems - a group of organs that work together, carrying out major functions.
Example: Muscular System, Nervous Systems
Organism
Organism - a living thing
In multicellular organisms; all the organ systems working together.
How do you move?
*The nervous system tells your muscles when and how to act.
*When muscles are told to move they pull on the bones of the skeletal system to allow for the movement.
Transporting materials
*Circulatory system brings materials such as oxygen to all cells and takes away waste from those cells such as carbon dioxide.
(circulatory system - circulates materials)
Breathing in, Breathing out
*Respiratory system moves oxygen into the body and carbon dioxide out of the body.
(When thinking about the respiratory system think about when we breathe in and out)
*When oxygen moves into the bloodstream the circulatory system delivers it to all cells and carries back carbon dioxide to be expelled.
Getting Food
*The oxygen brought in by the respiratory and circulatory systems is used to release energy from sugar in your food.
*Digestive System breaks down food into nutrients.
Absorption - process by which nutrients move from the digestive system into the bloodstream, to be delivered to all cells by the circulatory system.
Moving Waste
*Excretory system eliminates wastes from your body.
Controlling Body Functions
Your nervous system reacts to what is going on in your environment through your senses and tells your body how to react.
Stimulus - a signal in the environment that makes you react.
Response - what your body does in reaction to a stimulus.
The Nervous System
Central Nervous System
Brain and spinal cord
Messages are received, processed, and a response is sent out
Peripheral Nervous System
Nerves
voluntary actions:
walking
involuntary actions
breathing
Using our Senses
Chemical Input - a chemical that enters the body
Ex: smelling or tasting something
Mechanical Input - signals that enter the body through physical touch or vibration
Ex: touching or hearing something
Electromagnetic Input - signals that enter the body in the form of electromagnetic stimuli
Ex: seeing something
Picking Up Signals
Nerve Cell - a specialized cell for transmitting fast electro-chemical signals. Also called a neuron.
Sensory Receptors - a nerve ending that sends signals to the central nervous system when it is stimulated.
Processing Signals
Brain - organ that serves as the primary control center of the nervous system
Stimulus - an action or condition that provokes a response
Behavior - what a plant or animal does
Unit 2 Lesson 2
Levels of Organization
A group of specialized cells build tissue
A group of tissues build an organ
A group of organs build an organ system
A group of organ systems build an organism
*Least Complex → Most Complex
*Cells → Tissues → Organs → Organ System → Organism
Tissues
Tissue - group of similar cells that perform the same function
*example: nervous, epithelial, muscle, connective
N.E.M.C
Organs
Organ - structure that is made up of different kinds of tissue.
Examples: heart, brain, lungs, and skin
H.B.L.S
Organ Systems
Organ Systems - a group of organs that work together, carrying out major functions.
Example: Muscular System, Nervous Systems
Organism
Organism - a living thing
In multicellular organisms; all the organ systems working together.
How do you move?
*The nervous system tells your muscles when and how to act.
*When muscles are told to move they pull on the bones of the skeletal system to allow for the movement.
Transporting materials
*Circulatory system brings materials such as oxygen to all cells and takes away waste from those cells such as carbon dioxide.
(circulatory system - circulates materials)
Breathing in, Breathing out
*Respiratory system moves oxygen into the body and carbon dioxide out of the body.
(When thinking about the respiratory system think about when we breathe in and out)
*When oxygen moves into the bloodstream the circulatory system delivers it to all cells and carries back carbon dioxide to be expelled.
Getting Food
*The oxygen brought in by the respiratory and circulatory systems is used to release energy from sugar in your food.
*Digestive System breaks down food into nutrients.
Absorption - process by which nutrients move from the digestive system into the bloodstream, to be delivered to all cells by the circulatory system.
Moving Waste
*Excretory system eliminates wastes from your body.
Controlling Body Functions
Your nervous system reacts to what is going on in your environment through your senses and tells your body how to react.
Stimulus - a signal in the environment that makes you react.
Response - what your body does in reaction to a stimulus.
The Nervous System
Central Nervous System
Brain and spinal cord
Messages are received, processed, and a response is sent out
Peripheral Nervous System
Nerves
voluntary actions:
walking
involuntary actions
breathing
Using our Senses
Chemical Input - a chemical that enters the body
Ex: smelling or tasting something
Mechanical Input - signals that enter the body through physical touch or vibration
Ex: touching or hearing something
Electromagnetic Input - signals that enter the body in the form of electromagnetic stimuli
Ex: seeing something
Picking Up Signals
Nerve Cell - a specialized cell for transmitting fast electro-chemical signals. Also called a neuron.
Sensory Receptors - a nerve ending that sends signals to the central nervous system when it is stimulated.
Processing Signals
Brain - organ that serves as the primary control center of the nervous system
Stimulus - an action or condition that provokes a response
Behavior - what a plant or animal does