For rapid conduction of impusles or depo...

For rapid conduction of impusles or depolarizations, heart muscles possess.

Anchoring junctions

Tight junctions

Hemi desmosomes

Communicating junctions

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Heart muscles are

Muscles of heart are

Read the given statements and select the correct ones. (i)Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body. (ii)Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath. (iii)Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K^+) than to sodium ions (Na^+) (iv)A synapse is formed by the membranes of presynaptic neuron and a post synaptic neuron.

Name the muscles present in heart.

Contraction of muscle and conduction of nerve require

A : Presence of myein sheath increases the rate of conduction of nerve impulse. R : Ionic channels are absent in the area covered by myelin sheath therefore, depolarization occurs only at the nodes of Ranvier , resulting in saltatory or jumping conduction.

In a muscle undergoes rapid contraction and relaxation, the sarcoplasmic reticulum extension

Assertion: Heart wood is not involved in conduction function. Reason: Tyloses and depositions of tannins, resins, and gums is common in duramen cells.

Consider the following statements each with one or two blanks. (i)Each pectoral girdle consists of a (A) and (B) . (C) is a condition of rapid spasms (wild contractions) in muscle due to low Ca^(++) in body fuild. Each organised skeletal muscle in our body is made of a number of (D) held together by a common collagenous connective tissue layer called (E) . Which one of the following options correctly fills the blannks in any two the statements ?

AAKASH SERIES-STRUCTURAL ORGANISATION IN ANIMALS-EXERCISE-III (PREVIOUS AIPMT/NEET QUESTIONS)

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