Nerve and Muscle Physiology — Flashcards

Flashcard 71: Which nerve fibres are the most susceptible to hypoxia?_____

Answer: B

Flashcard 72: Latent period in a preloaded muscle contraction is _____ than afterloaded muscle contraction

Answer: less

Flashcard 73: The inhibitory interneuron is called a Renshaw cell and its neurotransmitter is _____.

Answer: glycine

Flashcard 74: Which nerve fiber efferents innervate dynamic nuclear bag fibers?

Answer: Gamma dynamic motor neurons (Dynamic γ motor neurons)

Extra: Muscle spindles consist of intrafusal fibers: 1. **Dynamic nuclear bag fibers**: Innervated by **gamma dynamic (γd)** motor neurons. 2. **Static nuclear bag fibers** and **nuclear chain fibers**: Innervated by **gamma static (γs)** motor neurons.

Flashcard 75: For K+ ion the equilibrium potential calculated by Nernst equation is _____.

Answer: -90mV

Flashcard 76: _____ fibre is responsible for detecting the static muscle length

Answer: Static nuclear bag and nuclear chain

Flashcard 77: Slow EPSPs and IPSPs are not generated by _____ muscles.

Answer: skeletal

Flashcard 78: What change is seen in the RMP when the extracellular concentration of K+ decreases ?_____

Answer: Increased negativity of RMP

Flashcard 79: The maximum contractile force of any muscle per square cm cross-sectional area is _____ kg/cm2

Answer: 3-4

Flashcard 80: Which nerve fiber afferents innervates all three muscle spindle fibres (dynamic nuclear bag, static nuclear bag, and nuclear chain fibers)?_____

Answer: Type Ia