9 public questions tagged with this topic.
The sinoatrial (SA) node is the natural pacemaker of the heart and initiates electrical impulses for contraction. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
The duration of **one complete cardiac cycle** is about **0.8 seconds** in a healthy adult. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
**Diastolic pressure occurs when the heart relaxes**, while **systolic pressure** occurs during ventricular contraction. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
Congestive heart failure occurs when the left ventricle fails to pump blood effectively, leading to fluid buildup in the lungs.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Regulation and Disorders of Circulatory System
Cardiac output is calculated as stroke volume × heart rate and varies depending on physical activity.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Regulation and Disorders of Circulatory System
Cardiac output varies depending on physical activity, stress, and health conditions.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Regulation and Disorders of Circulatory System
The P-wave represents atrial depolarization, not ventricular contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
The P-wave represents atrial depolarization, not ventricular contraction.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation ECG and Blood Vessels
