BTEC Applied Science: Biology - Unit 1:
Nervous Tissue Questions And Answers
With Verified Solutions 100% Correct!!!
Cell body - ANSWER✔✔Nucleus and ER; produces proteins and
neurotransmitters
Dendrons - ANSWER✔✔Extensions of cell body which divide into dendrites that
carry impulses toward the cell body
Axon - ANSWER✔✔Long fibre that carries impulses away from the cell body
Schwann cells - ANSWER✔✔Forms layers to protect axon and provide insulation;
also carrying out phagocytosis
Myelin sheath - ANSWER✔✔Membranes of Schwann cells cover axon, causes
faster transmission of impulse
Nodes of Ranvier - ANSWER✔✔Gaps between adjacent Schwann cells where
there is no myelin sheath
Sensory neurone - ANSWER✔✔Transmits impulses from receptor to intermediate
neurone; they have one dendron and one axon
Intermediate neurone - ANSWER✔✔Transmits impulses between neurones; they
have many dendrites and short axons
, Motor neurone - ANSWER✔✔Transmits impulses between intermediate neurones
to effectors; they have a long axon and many short dendrites
What are the four nerve impulses? - ANSWER✔✔1) Establishment of resting
potential (polarisation)
2) Generation of a potential difference e.g., by a receptor (generator potential)
3) Movement of impulse - action potential (depolarisation)
4) Re-establishment of resting potential (repolarisation)
The phospholipid bilayer is impermeable to... - ANSWER✔✔Na+ and K+ ions
In the phospholipid bilayer, there is a presence of gated and non-gated (open)... -
ANSWER✔✔Na+ and K+ channels
In the phospholipid bilayer there is an active sodium-... - ANSWER✔✔potassium
pump
For resting potential, what gets pumped into and out of the axon? -
ANSWER✔✔Na+ pumped out as K+ pumped in
For resting potential, how many sodium ions move out as how many potassium
ions move in? - ANSWER✔✔3 Na+ ions for every 2 K+ ions
For resting potential, what does the outward movement of Na+ do? -
ANSWER✔✔Allows there to be more Na+ outside the membrane and a diffusion
gradient is created.
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