hi. It is time for today's question. The answer to the last two questions will be given now.
1)as 1=5
5=1. (the accurate answer is not given by people)
2) leap year (right answer given)
The question is---
We don't get sound when muscles move. But we hear a lub dub sound saying her heartbeat. Our heart is surrounded by muscles. So, it is not the sound made by the heart ❤️. Then what makes this sound. Give accurate explanation as it is for 25 marks. All the Best for quiz. Follow me for updates
Answers
Heart sounds are created from blood flowing through the heart chambers as the cardiac valves open and close during the cardiac cycle. Vibrations of these structures from the blood flow create audible sounds — the more turbulent the blood flow, the more vibrations that get created. The same variables determine the turbulence of blood flow as all fluids. These are fluid viscosity, density, velocity, and the diameter of the column through which the fluid is traveling. Auscultation of the heart sounds with a stethoscope is a cornerstone of physical medical exams and a valuable first-line tool to evaluate a patient. Some sounds are very characteristic of significant pathological lesions that have major pathophysiological consequences, and these first present on auscultation. These type of lesions can be heard in systole, diastole, or continuously through the cardiac cycle.
Muscles are not responsible for transferring the vibrations. We can just feel those vibrations. Can we hear our heartbeat? Usually not. The 'lub-dub' of your heartbeat is always there, a sound which signifies the large lump of muscle in your chest is working away to keep the blood pumping around your body. But unless you're scared out of your wits or puffing from exercise, you will likely never hear your heart beating. Because, that time, your adrenaline hormone is released which increases your heartbeat.
Hope, this can clear your concept.