Organisms Respond to changes in their environments Condensed Notes

Organisms Respond to changes in their
environments
● Response to Stimuli
○ Plant growth factors
■ Tropisms
○ Control of heart rate
■ Pressure/chemoreceptors
○ Receptors
■ Pacinian corpuscles
■ Eye: rods/cones
○ Nervous organisation
■ Reflex arc
● Nervous coordination and muscles
○ Synapses
■ Synaptic transmission
○ Nerve impulse
■ Resting potential
■ Action potential
■ Speed of nerve impulse
○ Structure of muscle
■ Muscle contraction
■ slow/fast twitch
● Homeostasis
○ Principles
○ Feedback mechanisms
○ Hormones and regulation
○ Hormones in osmoregulation
○ Control of blood water potential
○ Structure and role of nephron


● Response to stimuli
● Responding to their environment helps organisms survive
● The nervous system

, ○ Reflex arc




■ Stimulus → Receptors → Central Nervous System → Effectors →
Response