Define the following terms:
$(1)$ Intercalated disc
$(2)$ Neuromuscular junction
$(1)$ Intercalated disc
$(2)$ Neuromuscular junction
(N/A) $(1)$ Intercalated disc: These are specialized cell-to-cell junctions that connect adjacent cardiac muscle cells. They facilitate the rapid transmission of electrical impulses,allowing the heart muscle to contract as a single functional unit (syncytium).
$(2)$ Neuromuscular junction: This is the chemical synapse formed between a motor neuron and a muscle fiber. It is the site where the neurotransmitter (acetylcholine) is released to initiate muscle contraction.
$(2)$ Neuromuscular junction: This is the chemical synapse formed between a motor neuron and a muscle fiber. It is the site where the neurotransmitter (acetylcholine) is released to initiate muscle contraction.
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Lack of relaxation between successive stimuli in sustained muscle contraction is known as
Analogy type questions:
$(1)$ The portion between two successive $Z$-lines is the functional unit of contraction,which is called the sarcoplasmic reticulum / sarcomere.
$(2)$ The thick filaments in the $A$-band are held together in the middle of this band by a thin fibrous membrane. It is called the $Z$-line / $M$-line.
$(1)$ The portion between two successive $Z$-lines is the functional unit of contraction,which is called the sarcoplasmic reticulum / sarcomere.
$(2)$ The thick filaments in the $A$-band are held together in the middle of this band by a thin fibrous membrane. It is called the $Z$-line / $M$-line.
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View SolutionThe head of a myosin monomer consists of:
$I.$ Actin binding sites
$II.$ $ATP$ binding sites
$III.$ $ADP$ binding sites
$IV.$ $AMP$ binding sites
Select the correct options:
$I.$ Actin binding sites
$II.$ $ATP$ binding sites
$III.$ $ADP$ binding sites
$IV.$ $AMP$ binding sites
Select the correct options:
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View SolutionIf a muscle fails to give stimulation action and there is much ingestion of lactic acid,the condition is termed as
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View SolutionThe immediate energy source for muscle contraction is:
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