Cardiovascular and Nervous System

Women's hearts typically beat faster than men's hearts, averaging around 78 beats per minute compared to 72 bpm for men. This is primarily due to women's generally smaller heart size, which requires more frequent contractions to pump the same amount of blood.

The human heart has four chambers: two atria (left and right) and two ventricles (left and right). This is a fundamental anatomical fact in biology. The heart does not have 6, 8, or 12 chambers in humans.

Fainting (syncope) causes a temporary slow pulse due to reduced venous return and brief bradycardia from vasovagal response. Fever increases pulse rate due to metabolic demands. Emotional stress causes tachycardia. Hypoglycaemia typically causes tachycardia as the body compensates for low blood glucose.

The normal resting heart rate for adults ranges from 60-100 beats per minute, with 60-80 bpm representing the average range. The other ranges are either too low (bradycardia) or represent the upper end which may indicate tachycardia depending on context.

The normal resting heart rate for adults is typically 60-100 beats per minute, with 72 bpm being a commonly cited average. This can vary based on age, fitness level, and health status. The statement is factually correct as a general reference point.

The normal resting heart rate for adults is 60-100 beats per minute, with 72 bpm often cited as the average. A rate of 70 bpm falls within this healthy range. Rates of 50 bpm (borderline bradycardia), 80 bpm (normal but high), and 100 bpm (tachycardia threshold) are less representative of the average.

ECG (Electrocardiogram) records the electrical activity of the heart over time using electrodes placed on the skin. It is the primary diagnostic tool for detecting heart rhythm abnormalities (arrhythmias), heart attacks, heart enlargement, and other cardiac conditions. It does not directly assess brain, kidney, or lung function.

When the heart muscle is suddenly damaged by an inadequate blood supply, it is referred to as heart attack.

Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.

The T-wave represents the return of the ventricles from excited to normal state (repolarisation). 

The T-wave represents the return of the ventricles from an excited to a normal state (repolarisation). The end of the T-wave marks the end of systole.

Aneurysm is caused due to circumscribed dilation of an artery.

Unlike stroke volume, contractility is independent of preload and afterload and is an innate property of myofibrils. It can be influenced by inotropes (e.g. dobutamine).