FNS 29 Temperature Regulation

What regions of the CNS are responsible for the regulation of body temp?
- Hypothalamus
- Spinal Cord
Which thermoreceptors are more numerous?

Cold receptors (3-10x)
Cold Receptors:
Fiber type?
Maximum a.p. range?
- Small myelinated fibers
- 23-28 C
Warm Receptors:
Fiber type?
Maximum a.p. range?
- Unmyelinated C fibers
- 38-43 C
What types of fibers sense temperature pain?
- Cold-pain receptors (15 C)
- Heat-pain receptors (45 C)
What are the methods of increasing heat production and conserving heat?
- Posterior hypothalamus - control
- Shivering
- Voluntary exercise
- Peripheral vasoconstriction
- Piloerection
- Sympathetic activation - increases cellular metabolism
- Synth of thyroid hormone - increases cellular metabolism over several weeks
What is a set point?
- Core temperature where no thermoregulatory effector activity required
- Changed by thermoreceptor input
What region in the brain is responsible for increasing heat dissipation?
- Anterior hypothalamus
- Lesions result in hyperthermia
What are the methods for increasing heat dissipation?
- Vasodilation
- Cholinergic activation of sweat glands
- Inhibition of heat production
- Behavioral modifications (clothing...)
What causes a fever?
- Pyrogens influence the hypothalamus by increasing prostaglandin synthesis
- This elevates the thermal set point

Author

zf2010

72165

Card Set

FNS 29 Temperature Regulation

Description

FNS 29 Temperature Regulation

Updated

2011-03-11T02:23:25Z

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