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Briefly describe the following: Angina Pectoris - Biology

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प्रश्न

Briefly describe the following:

Angina Pectoris

टिप्पणी लिखिए

उत्तर

  1. When enough oxygen does not reach the heart muscles, angina pectoris develops, causing chest pain and discomfort.
  2. Angina pectoris is the pain in the chest. It results from a reduction in blood supply to cardiac muscle due to narrowed and hardened coronary arteries.
  3. Angina pectoris often occurs during exertion, when the heart demands more oxygen and narrowed blood vessels cannot supply. It disappears with rest.
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अध्याय 18: Body Fluids and Circulation - Exercises [पृष्ठ १०५]

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एनसीईआरटी एक्झांप्लर Biology [English] Class 11
अध्याय 18 Body Fluids and Circulation
Exercises | Q 3. b. | पृष्ठ १०५

संबंधित प्रश्न

Water reaches great heights in the trees because of suction pull caused by ______.


How does transpiration help the roots absorb water and minerals from the soil?


Given below is a diagrammatic sketch (surface view) of a stomatal apparatus from a dicot leaf.

 

(a) Label the parts numbers 1-3
(b) Is this state, open or closed?
(c) Is this stoma, of a dicot leaf or a monocot leaf?
(d) Redraw a sketch of the stomatal apparatus in the state opposite to the one shown here. 


Name the tissue which conducts water absorbed by the roots to the upper parts of a herbaceous plant.

The figure below represents the set-up at the start of certain experiment to demonstrate an activity of plants:
(i) What is the aim of the experiment?
(ii) Why has oil been put in each test tube?
(iii) What will be the observations in the two test-tubes after about 2-3 days?
(iv) Give reasons to explain any change observed as answered in (iii) above.
(v) Why has the test-tube b without the plant, been taken in the experiment?


An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:

Why was the pot covered with a plastic sheet?


An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:

List three adaptations in plants to reduce the above mentioned process.


What are stomata? What governs the opening and closing of stomata?


Transpiration takes place through ______.


Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.


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