Answer:
The Big Bang is an expansion event that occurred about 13.7 billion years ago
Explanation:
The Big Bang Theory is the leading explanation for how the universe began. Simply put, it says the universe as we know it started with an infinitely hot and dense single point that inflated and stretched — first at unimaginable speeds, and then at a more measurable rate — over the next 13.8 billion years to the still-expanding cosmos that we know today.
Fibers are not visible with normal stains
The chordae tendineae of the av valves are anchored to the Papillary muscle of the ventricle of the ventricles.
Chordae tendinae are code like tendons that connect the papillary muscles to the tricuspid valve and the mitral valve. (atrioventricular valves). This papillary muscle are located in the ventricle of the heart and they attach to the cusps of atrioventricular valve.
<h3>What is chordae tendineae ?</h3>
The chordae tendineae are thin, strong, inelastic fibrous cords that run from the free edge of the atrioventricular valve cusps (the tricuspid and mitral valves) to the apices of the papillary muscles in the right and left ventricles, respectively. The singular chorda tendinea is a rare term.
- One of the mitral valve leaflets may completely lose tension due to a primary chordae tendineae rupture (CTR), at which point it will flail. This frequently causes the MR to suddenly worsen, resulting in fainting and/or acute congestive heart failure (CHF).
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