Describe a water conducting tisue ?

Go through the following statements (i) Vagus nerve decreases the rate of impulse formation from the SA node and its conduction (ii) As the human heart is myogenic in nature, the rate of formation and conduction of cariac impulse cannot be changed by the action of nerves (iii) The end of T-wave in ECG marks the end of systole. (iv) If the P-wave in ECG is inverted , it indicates that SA node fails to initiate impulse and the atrial muscle depolarises by the impulse originating in A.V. node. Whic of these are correct ?

Describe the function of the heart.

Describe the one major type of semiconductors and contrast their conduction mechanism.

Mention any one application of beats.

Describe the evolutionary change in the pattern of heart among the vertebrates.

Describe an experiment conducted by Oersted to demonstrate that magnetic field is produced by electric current.

Mary is about to face an interview. But during the first five minutes before the interview she experiences sweating, increased rate of heart beat, respiration etc. Which hormone is responsible for her restlessness