The smallest mitochondrial genomes in Plasmodium, are only about 6 kb, encoding three proteins and the mitochondrial rRNAs.

Arabidopsis thaliana, has 366 kb of mtDNA and cucurbit plants have about 2 Mb of mtDNA.

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p75 NTR forms heteromeric complexes with the different Trk receptors and enhances Trk receptor signaling

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Schwann cells and astrocytes produce ciliary neurotrophic factor which promotes the survival of damaged and embryonic spinal cord neurons

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A synapse is a site where information is transmitted from one cell to another. 

Types of synapses:

1. electrical synapse

2. chemical synapse

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Principle of one-way conduction at chemical synapses 

always transmit the signals in one direction i.e., from the neuron that secretes the neurotransmitter called the presynaptic neuron, to the neuron on which the transmitter acts, called the postsynaptic neuron

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Once an impulse reaches the presynaptic terminals, a response can be obtained in the postsynaptic neuron after a Synaptic delay.

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Synaptic delay is due to the time it takes for the synaptic mediator to be released and to act on the receptors on the membrane of the postsynaptic cell. 

The minimum time for synaptic delay is 0.5 ms