Download App

Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation3 Marks
Question
Why does atrial systole always precede ventricular systole?
✓

Answer

  • The cardiac impulse arises from the SA node located in the wall of the right atrium.
  • The impulse first spreads through the atrial musculature, causing the atrial systole.
  • Then it passes through AV node and AV bundle to the ventricles to initiate ventricular systole, before which the atrial systole is completed; hence atrial systole always precedes ventricular systole.

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

Explore more

More "3 Marks Question" from Body Fluids and Circulation→Body Fluids and Circulation — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Explain the process of formation of vascular cambium.
→
Name the antigen(s) and antibodies (of blood groups) present in the blood of persons with the following blood groups:
  1. A
  2. B
  3. O
→
Answer the following questions with reference to the anatomy of dicot stem
  1. Type of cells present in the hypodermis.
  2. Why is the endodermis layer referred to as starch sheath?
  3. Why are the vascular bundles present here referred to as 'open' and 'conjoint'?
→
Compare the following :
Central neural system (CNS) and Peripheral neural system (PNS)
→
What is the importance of plasma proteins?
→
What are the structural characteristics of:
  1. Meristematic cells near root tip?
  2. The cells in the elongation zone of the root?
→
Give one antagonistic functions of each of the following hormone pairs.
  1. Gibberellins- Abscisic acid
  2. Cytokinin- Ethylene
  3. Ethylene- Auxin
→
Explain the reasons of following.
  1. Photosynthesis can occur in the absence of light.
  2. Even non-green leaves can make the food.
  3. Photosynthesis can occur under water.
→
Name the division in which true jaws are absent. Write any four differences between Pisces and Tetrapoda super class.
→
Raju has recently joined the gym. The very first day, while doing exercise, he felt increased rate of respiration, heartbeat, sweating, etc. He got worried as he experienced the sudden changes in his body. He discussed it with his brother who is a biology student. His brother smiled and explained him that these are the normal activities of the organs/ organ systems that occur during exercise for the maintenance of normal physiology of the human body.
  1. Name the processes that are necessary for maintaining normal physiology of the human body.
  2. Define coordination and integration.
  3. Explain the functions of various organs of the by body that are coordinated and integrated during exercise.
  4. What values did Raju's brother possess?
→