- How long is the time between two atrium systoles in a normal heart rate of 75 yythm/min a. 800ms b.530ms c. 260ms d.110ms What is the pressure normally during left ventricular systole in left ventricle? 4mmHg b.10 mmHg c.120mmHg d. 25mmHg

For the first question:<br /><br />The correct answer is c. 260ms.<br /><br />Explanation: In a normal heart rate of 75 beats per minute, the time between two atrium systoles (atrial contraction) is approximately 260 milliseconds. This is because the atria contract slightly before the ventricles, allowing the ventricles to fill with blood before they contract. The time between two atrial systoles is known as the atrial filling time or diastolic time, which is approximately 260 milliseconds in a normal heart rate.<br /><br />For the second question:<br /><br />The correct answer is c. 120mmHg.<br /><br />Explanation: The pressure during left ventricular systole in the left ventricle is typically around 120mmHg. This is the pressure that the left ventricle generates to pump oxygenated blood into the aorta and throughout the body. The pressure during left ventricular systole is known as the systolic blood pressure, which is the higher number in a blood pressure reading.