Ch14 Receptors Flashcards
1
Q
Voluntary nervous system
A
- carries nerve impulses to body muscles
- under conscious control
2
Q
Autonomic nervous system
A
- carries nerve impulses to glands, smooth muscle and cardiac muscle
- under involuntary control
3
Q
peripheral nervous system
A
pairs of nerves that originate from brain/spinal cord
- sensory
-motor
4
Q
Reflex arc pathway
A
- stimulus
- receptor
- sensory neurone
- coordinator(intermediate neurone)
- motor neurone
- effector
- response
5
Q
Impotance of reflex arc
A
- Involuntary- brain is not overloaded
- Protect body from harm
- Fast because pathway is short with little synapse
- Action is rapid
6
Q
Pacinian corpuscle generator potential
A
- increased pressure deforms the stretch mediated sodium ion channel
- sodium channels open and sodium ions enter
- influx changes membrane potential - more positive
- depolarisation
- generator potential creates action potential
7
Q
Location of Pacinian corpuscle
A
- joints, ligaments and tendons
- soles of feet
- deep in skin
- fingers
8
Q
Transducer
A
Converts change in form of energy by stimulus into generator potential
9
Q
rod cell location
A
periphery of retina
10
Q
Rod cell light intensity
A
- several rod cells to single bipolar cell (retinal convergence)
- summation
- multiple generator potentials
- greater chance threshold value exceeded at low light intensity
- Rhodopsin is broken down
11
Q
Rod cell visual acuity
A
- several rod cells connected to single bipolar cell- retinal convergence
- only generates single impulse
12
Q
Visual acuity
A
Resolving power- ability to distinguish close objects
13
Q
Location of cone cells
A
fovea
14
Q
Cone cell colour
A
Have 3 different types of iodopsin that are sensitive to different light wavelengths
15
Q
Cone cells visual acuity
A
- each cone cell is connected to single bipolar cell
- brain receives many impulses
- high visual acuity
