Explain the process of the transport and release of a neurotransmitter with the help of a labelled diagram showing a complete neuron, axon
terminal and synapse.
A nerve impulse is transmitted from one neuron to another through a gap known as synapse. Membrane of presynaptic neuron and postsynaptic neuron forms synapse which may or may not be separated by a gap called synaptic cleft. At chemical synapse, the membrane of the pre and post synaptic neurons separated by a fluid filled space known as synaptic cleft. There are some vesicles filled with chemicals transmitters in the axon terminal. These chemicals are called neurotransmitters that involve in transmission of impulses at these synapses. Once the neurotransmitters are released in the synapse, they are taken up by specialised channels that are present on the membrane of post- synaptic neuron. This process completes when neurotransmitters enters into post synaptic neuron.
Briefly describe the structure of the following:
(a) Brain
(b) Eye
(c) Ear
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
Write the difference between:
(a) Actin and Myosin
(b) Red and White muscles
(c) Pectoral and Pelvic girdle