L3 Flashcards
What are the types of skin receptors
Free nerve endings
Tactile discs
Tactile corpuscles
lamellar corpuscles
bulbous corpuscles
What does free nerve endings respond to?
Temp, Pain, movement and pressure
What do tactile discs respond to? location
Fine touch, light pressure
texture, shape and edges
epidermis
what do tactile corpuscles repsond to? location
delicate or discriminative touch
light pressure
low frequency vibration
Papillary layer
What do lamellar respond to and location
Deep pressure and vibration
Dermis and hypodermis
What do bulbous respond to and location
Sustained deep pressure and stretching or distortion of skin
Dermis and subcutaneous tissue
how does skin blood flow work?
Smooth muscles in walls of ateries innervated by sympathetic nervous system
How do reduce bloodflow?
Noradrenaline
how to achieve vasodilation?
Reduced activation of a1 receptors on smooth muscle
How to achieve vasoconstriction?
Activation of a1 receptors
what are the 4 mechanisms of heat transfer?
Radiation, evaporation, convection, conduction
how are eccrine sweat glands activated?
invervated by SNS using ACh
what happens when body heat is aboce set points?
Vasodilation (SNS activation of a1 receptors
SNS cholinergic activation of mAChRs on sweat glands
inc respiratory rate
what are the 3 heat generating mechanisms?
Shivering
Non shivering thermogensis
Increase in thyroxine
what is shivering?
Oscillatory contractions of agonist and antagonist muscles
