During each heartbeat, about 80 g of blood is pumped into the aorta in approximately 0.2 s. during this time, the blood is accel

Question

AURORKA [14]

2 years ago

5

During each heartbeat, about 80 g of blood is pumped into the aorta in approximately 0.2 s. during this time, the blood is accel

erated from rest to about 1 m/s.

Biology

2 answers:

aivan3 [116] · Answer 1 · 2023-04-01T19:58:10+03:00

I assume that in this item, we are asked to solve for the force exerted during the heartbeat. Force is the product of the mass and acceleration. To solve for the acceleration in this item, we divide the velocity by time.
a = 1 m/s / 0.2 s = 5 m/s²
Then, we multiply this by the mass (in kg)
F = (80 g / 1000 g/kg) x (5 m/s²)
= 0.4 kg m/s² = 0.4 J
Therefore, every hearbeat will take 0.4 J of force.

balu736 [363] · Answer 2 · 2023-04-01T22:24:47+03:00

The work done on the blood by the heart is 0.04 Joules.

Further Explanation:

The heart is a central and most vital part of the circulatory system which works to pump blood throughout the body. The heart pumps <u>oxygenated blood to the cells that need oxygen and increases the ability of the muscles to produce energy.</u> The delivery of oxygen in the working muscles can be affected by factors such as stroke volume, cardiac output, heart rate etc.

The change in energy determines the amount of work done on a particular object. Here, work is done by the heart on the blood in order to accelerate it. The acceleration in blood is responsible for an increase in the blood’s kinetic energy.

The initial kinetic energy of an object = 0

The final kinetic energy can be determined by using the following formula;

${\text{KE}}=\dfrac{1}{2}{\text{m}}{{\text{v}}^2}$