Home » Posts tagged 'heart'

Tag Archives: heart

Gravity and something more

Jihin Asked:

Some Things That I Have Always Wondered OF : (i hope it may be answered soon …)
1)is it possible that our human body can withstand pressures twice or more than the atmospheric pressure without a suite or is there any artificial instruments or means in which our heart can be made to pump into a level in which we can attain this ability !!!
2)when more gravity  is experienced , it is said that time travels slowly – is it  relative ??? caz time goes at a constant rate !!! it is only the position or view that makes the observer feel the situations ???
3) Is there any gravity chambers successfully made out … in which the gravity can be changed accordingly to observe diff. phenomena ??? Cant It be possible to do that ????

Ans:

To be posted soon.

However, I agree that I may not be able to give you a satisfying answer to all your queries, as “Science says the first word of everything and the last word of nothing.” We are learning new things everyday. When we explore more and more, we find that we know less and less and our knowledge is too meagre.

By the time I prepare a well fitting answer to this, visitors are also requested to respond to the question by posting answers and comments.

Weak in Physics ?

hai I am very week in physics please help me in recovering

aalap

Ans

I think you can write an essay about a bike that you have seen only once.How? Just because of your perception

Try to understand the concepts. You may be trying to by heart the topics .Avoid that .Develop the habit of writing and studying

Life Live and Waves

Sreeda Asked:

Is lifeline actually a wave?

Answer:

First of I have to clarify the question.

The word LifeLine has got more than one meaning.

See the link below for various reference to LifeLine

http://en.wikipedia.org/wiki/Lifeline

I hope your reference is towards ECG (If not, please respond to this post through the commenting system)

“The ECG works mostly by detecting and amplifying the tiny electrical changes on the skin that are caused when the heart muscle “depolarises” during each heart beat. At rest, each heart muscle cell has a charge across its outer wall, or cell membrane. Reducing this charge towards zero is called de-polarization, which activates the mechanisms in the cell that cause it to contract. During each heartbeat a healthy heart will have an orderly progression of a wave of depolarisation that is triggered by the cells in the sinoatrial node, spreads out through the atrium, passes through “intrinsic conduction pathways” and then spreads all over the ventricles. This is detected as tiny rises and falls in the voltage between two electrodes placed either side of the heart which is displayed as a wavy line either on a screen or on paper. This display indicates the overall rhythm of the heart and weaknesses in different parts of the heart muscle.” (Wikipedia)

The following links will be of help to learn more about ECG, its working and a little history

http://www.ecglibrary.com/ecghist.html

http://en.wikipedia.org/wiki/Electrocardiography

http://www.madehow.com/Volume-3/EKG-Machine.html

WAVE

A wave is the mechanism of transfer of energy through vibrations. In an ECG a waveform is generated corresponding to the pulses produced by heartbeats.

As such ECG cannot be treated as a wave. But the term wave is used to talk about the screen or print pattern obtained because of the graphical similarity with a wave pattern.

(Click the image on left for an animation of heart beats and the corresponding ECG obtained)

(I don’t think this as a complete answer. Anyone with better knowledge can add to this through comments)

DOWNLOAD the ebook  “How ECG works” here

Visitors So Far @ AskPhysics

  • 2,093,746 hits

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 4,003 other subscribers

askphysics@Twitter

  • Check out Mathew Abraham’s video! #TikTok > https://t.co/T50V2XAyhC
    about 3 weeks ago
%d bloggers like this: