In myogenic heart present on molluscs an...

In myogenic heart present on molluscs and vertebrates, action potential s generated from

AV node

mass of nerve cells

a patch of modified heart muscles and SA node

SA node

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Read the following statements and choose the correct option Statement 1: Atria receive blood from all parts of the body which subsequently flows to ventricles Statement2: Action potential generated at sinoatrial node passes from atria to ventricles.

During the propagation of a nerve impulse, the action potential results from the movement of :

Assertion : In membrane the concentration of Na^(++) and K^(+) , and proteins generates action potential. Reason : To maintain the unequal distribution of Na^(+) and K^(+) , the neurons use electrical energy.

Water falling from a 50 m high fall is to be used for generating electric enegy. If 1.8xx10^5kg of water falls per hour and half the gravitational potential energyh can be converted into electric energy, how many 100 W lamps can be it?

Some washing machines have cloth driers. It contains a drum in which wet clothes are kept. As the drum rotates, the water particles get separated from the cloth. The general description of this action is that the "Centrifugal force throws the water particles away from the drum". Comment on this statement from the viewpoint of an observer rotating with the drum and the observer who is washing the clothes.

Assertion : Sino-atrial node (SAN) is called the pacemaker Reason : SAN generates the maximum number of action potentials and is responsible for intiating and maintaining the rhythmic contractions of the heart.

As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth’s gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = 6.0 xx 10^(24) kg." radius" = 6400 km .

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