Question
What is an artificial pacemaker? Explain.

Answer

Artificial pacemaker: It is an artificial electronic device. It constantly sends a small amount of electrical charge to maintain rhythmicity of the heart. It is implanted in the upper thoracic region subcutaneously having a connection with the heart. It contains a pulse generator having a cell to produce electrical impulse. The lead in the form of a wire transmits the impulse. An electrode is connected to the portion of the heart where the impulse is transmitted.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Explain the following in terms of mycorrhizal association.
  1. Growth promotion.
  2. Antimicrobial substance.
  3. Nourishment.
  4. Adverse environment.
  5. Absorption of water.
How are glands classified on the basis of the mode of pouring out their secretions? Differentiate between them, with an example for each.
Differentiate between the animals of Chondrichthyes and Osteichthyes. Give six points.
What is the significance of step-wise release of energy in respiration?
Enlist the functions of polysaccharides.
Explain the main characteristics of pteridophytes.
Write a brief account of mosses.
Explain why xylem transport is unidirectional and phloem transport bi-directional.
During a painting class, the teacher asked students to draw a sketch and paint it by using only green colour. Ravi could not find green colour in his colour box and was scolded by the teacher who could easily see the green colour in the box. Suddenly teacher realised that Ravi was not able to identify the green colour and he could realise the fact that Ravi may be lacking the ability to differentiate colours. After school was over, teacher reported this matter to Ravi's parents.
  1. Did Ravi lack knowledge of colours?
  2. How do you perceive the colour of an object?
  3. Discuss the function of cones.
  4. What values did teacher possess?
Observe the given figure related to enzyme action and answer the following questions.
  1. What is the figure showing?
  2. Name the substances marked as (A) and (B).
  3. What does the arrows marked (C) to (E) indicate?