What is the function of a pacemaker? a. To stimulate the heart to contract b. To increase the force of cardiac contractions c. To increase the heart’s stroke volume d. To improve the heart’s contractility

a. To stimulate the heart to contract

Explanation:

A peacemaker uses small electrical impulses to stimulate the heart muscle chambers to contract. This contraction forces blood to flow. The device mimicks the hearts natural electrical conducting system and this electrical impulses are delivered through electrodes.

A. To stimulate the heart to contract.

Explanation:

A pacemaker is a small artificial device that is placed in the chest or abdomen to help control abnormal heart rhythms or heartbeat. This device uses electrical pulses to prompt the heart to beat at a normal rate.

This electrical impulse is propagated throughout the right atrium, and through Bachmann's bundle to the left atrium, stimulating the myocardium of the atria to contract.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.