Question
Give the cause for the Heart sounds.
✓
Answer
Heart sounds: These are resulted due to sharp closure of heart valves. The first sound 'lub' occurs at the onset of ventricular systole and; is caused due to sharp closure of AV valve and the ejection of blood from the ventricles.
The second heart sound 'dub' occurs at the beginning of ventricular diastole and is caused by sharp closure of the semilunar valves to the aorta and the pulmonary artery.
The second heart sound 'dub' occurs at the beginning of ventricular diastole and is caused by sharp closure of the semilunar valves to the aorta and the pulmonary artery.
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
How are animals of Platyhelminthes different from those of Annelida?
(i) In aerobic respiration the respiratory coefficient is infinite. Please explain.
(ii) Define the following: (a) Floating respiration (b) Protoplasmic respiration (c) External respiration (d) Internal respiration.
(ii) Define the following: (a) Floating respiration (b) Protoplasmic respiration (c) External respiration (d) Internal respiration.
What do grey and white matter in the brain represent?
How are muscles classified based on their location? Mention their important functions.
Examine the following diagram and answer the following questions:
i. What is the diagram representing?
ii. When point A becomes permeable to Na¹, what change occurs in the polarity of the membrane.
iii. What is the potential difference at point A called ?
i. What is the diagram representing?
ii. When point A becomes permeable to Na¹, what change occurs in the polarity of the membrane.
iii. What is the potential difference at point A called ?
RuBisCO is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCO carries out more carboxylation in C4 plants?
Angiosperms are the most advanced among plants and show more variety than any other division of plants. Additionally, most of the useful plants for us belong to the division angiosperm. Which of the following lessons can be taken from this? What are the benefits of learning multiple skills in our life?
- A diverse group of students is always good for academic learning.
- If a student knows multiple skills, then he is more likely to become relevant for the society.
- A student with better physical features is likely to be a better student.
A plant may have different names in different regions of the country or world. How do botanists solve this problem?
Write the differences between:
a. Blood and Lymph
b. Open and Closed system of circulation
c. Systole and Diastole
d. P-wave and T-wave
a. Blood and Lymph
b. Open and Closed system of circulation
c. Systole and Diastole
d. P-wave and T-wave