Question

The volume of blood pumped by heart in one minute is called?
A. Heart rate
B. Systole
C. Cardiac output
D. Diastoles

Answer 1

The heart is a vital organ that functions to drive the blood through the circulatory system to reach the different parts of the body. It also delivers the nutrients, oxygen and removes harmful gases and other toxic elements as cellular wastes. The heart works in a continuous manner to carry out various functions effectively.

Complete answer:
The blood pumped by the heart is continuous and is regulated to maintain the flow of blood to different parts of the body. The heart pumps the blood and follows a particular rhythmicity. The volume of blood that is pumped by the heart through the right and the left ventricle is known as the cardiac output. It is the volume of blood pumped by the heart per minute of time.
Cardiac output is denoted in values denoted as L/min. It is calculated as the product of heart rate (HR) and the stroke volume (SV). Heart rate is calculated as the number of heart beats in one minute. The stroke volume is defined as the volume of the blood pumped from the ventricle in one beat or heartbeat.
Cardiac output is dependent on the quantity of blood that is delivered to different parts of the body. It also affects the oxygen delivery to the different tissues through the circulatory system. There are a number of clinical measures to measure the cardiac output. Cardiac output can also be affected by changes in the phase of respiration such as the intra thoracic pressure changes and influences the diastolic condition of the heart. It should be measured over a single cycle or averaged over several cycles. In a healthy person if the weight is 70 Kgs and heart rate is about 70 beats per minute and the stroke volume will be 70ml. The cardiac output at rest can be averaged out at 5L/minute.
The systole and diastole are the part of the cardiac cycle. Cardiac cycle is the cycle that ranges from one heartbeat to the beginning of the next. During diastole, the heart muscles relax and the heart is refilled with blood while in the systole, blood is pumped by the heart.

Therefore, the correct option is option C.

Note: Cardiac output can be defined as the amount of blood that is pumped by the heart per minute and it is calculated as the product of heart rate and stroke volume. The factors that influence cardiac output are the factors that cause changes in the heart rate / volume. The value of cardiac output can be affected by several diseases and deficiencies of the heart.