what makes a human heart keep beating?

Answer 1

the heart and the brain work in conjunction with each other, electrical impulses from the brain keep the heart beating and circulating blood and the heart keeps blood flowing through the brain to keep these impulses continuous

Answer 2

Contraction of the muscle fibers in the heart is controlled by electricity that flows through the heart in a precise manner along distinct pathways and at a controlled speed.

The electrical current that begins each heartbeat originates in the heart's pacemaker (sinus or sinoatrial node), located in the top of the upper right heart chamber (right atrium).

So the short answer is there is a particular nerve that causes an electrical wave across the heart muscle that causes it to contract rhythmically.

Answer 3

The rhythmic sequence of contractions is coordinated by the sinoatrial and atrioventricular nodes. The sinoatrial node, often known as the cardiac pacemaker, is located in the upper wall of the right atrium and is responsible for the wave of electrical stimulation (See action potential) that initiates atria contraction. Once the wave reaches the atrioventricular node, situated in the lower right atrium, it is conducted through the bundles of His and causes contraction of the ventricles. The time taken for the wave to reach this node from the sinoatrial nerve creates a delay between contraction of the two chambers and ensures that each contraction is coordinated simultaneously throughout all of the heart

Answer 4

Quick easy answer is electrochemical potential that causes muscles to contract and relax. The long of it is that the heart contracts it's muscle based on the influx and efflux of certain chemical ions, namely, sodium (Na+), Calcium (Ca++) and Potassium (K-). There are pumps within muscle cells that alter the concentration of these ions creating a postively charged side and negatively charged side that cause the conduction of an electical impulse and ultimately the contraction of the heart muscle.

Answer 5

It has a pacemaker of sorts in special fibers that depolarize to start a wave of depolarizations through out the rest of the heart muscle, starting at the SA node.

See a physiology text, their are other inputs from the brain and adrenal medula that modulate the heart rhythm

Answer 6

the heart's got an inbuilt pacemaker - a centre from which electrical shockwaves spread through the heart and cause the muscle to contract, thus producing the heartbeat.
If it starts acting up - you get an artificial pacemaker put in to make it beat evenly again.

Answer 7

Sorry, you are all wrong.
It is ultimately the electrochemical potential established by the semipermeability of the cell membrane to sodium, potassium and calcium. Their regulation leads to changes in the tertiary structure of troponin (a component of actin) via other protein cascades and the contraction of the muscle fibres.
The molecule adenosine triphosphate, ATP, provides the energy for this process. Without it you die!

Answer 8

the answer is the brain, the autonomic nervous system tells the heart to keep on beating while the individual is still alive.

Answer 9

blood vessels that makes the blood go in the heart and leave in a orderly fashion but once a vessel gets clots you start getting problems. basically when your older though and theres medication for that now.

Answer 10

The blood going round the circulatory system.