Gen bio

• Endocrine system or chemical - produce hormone
• Endocrine system / chemical - slow acting but long term
• Nervous system - fast acting but short term
• 2 Main division of nervous system:

  1. Central Nervous system
  2. Peripheral Nervous system
• Central nervous system - brain and spinal cord
• Peripheral nervous system - nerves that travels from CNS
• Peripheral Nervous system - Cranial nerves
• Motor neurons - Muscle and glands
• Somatic Nervous system - voluntary movements
• Autonomic Nervous system - involuntary responses
• Brain - receives and processes sensory information
• Spinal cord - conducts signals to and from the brain, control reflex activities.
• Sensory Neurons - Sensory organs to CNS
• Sympathetic Division - "Fight or Flight"
• Parasympathetic Division - "Rest or Digest"
• Neurons (nerve cell) - A cell that transmits electrical impulses.
• Neurons - basic unit of nervous system
• Dendrites - receive
• Axon - transmit
• Cell bodies - Integration
• action potentials are conducted to the axon terminals
• Neurotransmitter release - transmits a signal to target cell.
• Synapse - meeting point of nerves
• Synapse - Neurotransmitter
• Efferent (Motor) Neurons - Away from the brain
• Afferent (Sensory) Neurons - Towards the brain
• Interneuron - connects efferent and afferent
• Skeletal system - structure
• 270 - child bone
• 206 - adult bone
• Hydrostatic skeleton - fluid Ex. Flatworms, starfish
• Endoskeleton - Inner Ex. Humans
• Exoskeleton - Outside Ex. shrimp, turtle
• Bone - tough and rigid form of connective tissue
• Cartilage - form of connective tissue but is not as tough and rigid as bone.
• Bones - highly mineralized with calcium salts
• Joints - important components of human skeleton because they make the human skeleton mobile.
• Joint - occurs between 2 or more bones, bone and cartilage, and cartilage and cartilage
• Origin - Least movement (clavicle)
• Insertion - jaw (mandible)