sci q3 nervous system

• nervous system


  connects all your body parts and transmits signals from one part to another. It is a system of cells, tissues, and organs that regulates the body's responses to internal and external stimuli.
• central nervous system


  serves as the main processing center for the entire nervous system.
• brain and spinal cord


  cns two main components
• cerebrum, cerebellum, brain stem


  brain 3 main parts
• Brain


  This is an organ located within the skull that functions as organizer and distributor of information for the body.
• Cerebrum


  - large, upper part of the brain that controls activity and

  thought.
• Cerebellum


  - the part under the cerebrum that controls posture,

  balance, and coordination.
• Brain Stem -


  the part that connects the brain to the spinal cord

  and controls automatic functions such as breathing, digestion, heart rate, and blood pressure.
• Spinal Cord


  This serves as a channel for signals between the brain and the rest of the body, and controls simple musculoskeletal reflexes without input from the brain.
• Peripheral Nervous System (PNS)


  connects the central nervous system to the organs and limbs.
• somatic nervous system and autonomic nervous system


  pns two main divisions:
• Somatic Nervous System


  This system is associated with the voluntary control of body movements and has two main parts:
• spinal nerves and cranial nerves


  somatic 2 main parts
• Spinal Nerves


  - the nerves that carry motor and sensory signals between the spinal cord and the body.
• Cranial Nerves -


  the nerve fibers that carry information into and out

  of the brain stem
• sympathetic and parasympathetic


  autonomic 2 subdivision
• Autonomic Nervous System


  This system is associated with the involuntary control of body movements
• Sympathetic


  - it is activated when the body is in a dynamic role or stress. (e.g., increased heart rate and breathing, dilation of pupil, sweating, etc.)
• Parasympathetic -


  it maintains body functions and restores the body to normal or relaxed mode.
• nerve cell.


  The basic unit of the nervous system is the
• neurons.


  Nerve cells are called
• dendrites and axons.


  Projecting out from the cell body are root-like structures. These are the
• nerves


  Axons can be grouped together into cable-like bundles called
• Neurons


  are cells with the special ability to carry signals or impulses.
• synapse


  The chemical crosses the space between neurons called
• -the eyes, ears, nose, tongue, and skin.


  The nervous system is assisted by five sense organs
• A stimulus (plural: stimuli)


  is any factor in the environment that may trigger a nerve impulse.
• neurotransmitter


  When a nerve impulse comes to the end of an axon, it produces the chemical, called
• ^DENDRITES-


  carry impulses towards the body
• ^AXONS


  carry impulses away from the body. Passes impulses to the dendrites of other neurons or cell body of muscle cell.
• nerve impulse-


  combination of electrical charge and a chemical reaction, an electrochemical signal moving along a neuron
• RESPONSE-


  a reaction to a stimulus
• REACTION TIME-


  the length of time between application of a stimulus and detection of a. response
• Endocrine System


  •Control and regulates body

  processes

  •In control of the mechanisms in

  the body that slowly take place

  such as cell growth.
• •They both control and regulates body processes

  Hows endocrine system similar to nervous system?
• Endocrine Glands

  Hormones

  bloodstream

  Target Organ


  endocrine system function
• ENDOCRINE GLAND


  - an organ that produces chemical secretions released directly into the bloodstream.
• HORMONE


  a chemical substance that produced in the body that controls and regulates the activity of certain cells or organs.
• BLOODSTREAM.


  the flow of blood with hormones around the body
• PITUITARY GLAND


  Stimulates growth, and control the functions of other glands