Question
Explain heart sounds.
✓
Answer
During one cardiac cycle, two types of sounds are produced, which are known as heart sounds.
(1) First Heart Sound: It marks the beginning of ventricular contraction and is produced when the mitral and tricuspid valves close. This sound is known as "LUBB".
(2) Second Heart Sound: It marks the beginning of ventricular relaxation. This sound is produced by the closure of semilunar valves (SLV) and is heard as "DUBB."
(1) First Heart Sound: It marks the beginning of ventricular contraction and is produced when the mitral and tricuspid valves close. This sound is known as "LUBB".
(2) Second Heart Sound: It marks the beginning of ventricular relaxation. This sound is produced by the closure of semilunar valves (SLV) and is heard as "DUBB."
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is the difference between direct and indirect development?
Write short notes on:
- Kingdom Plantae.
- Kingdom Animalia.
- Bacteria.
- Lichens.
Write short notes on:
- Erythrocytes.
- Leucocytes.
- Structure of Heart.
Distinguish between a Bird and Bat.
Write any four characteristics of class, ‘Aves’.
In which organisms these structures are found and what is their role?
- Paramylon.
- Pseudoplasmodia.
- Heterocysts.
Write brief note on the following
Synaptonemal complex.
Synaptonemal complex.
What are the effects of hypothyroidism (observed during pregnancy) on the development and maturation of a growing baby?
Compare the following:
Central neural system (CNS) and Peripheral neural system (PNS)
Central neural system (CNS) and Peripheral neural system (PNS)
Write the description of gynoecium in various plants.