Tobacco is the answer to your question
Answer:
B. Right AV valve
Explanation:
In Human anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
Generally, the right atrioventricular valve (AV) is also referred to as the tricuspid valve and is located on the right dorsal side of the human heart. The right atrioventricular valve (AV) comprises of three (3) leaflets (flaps) which opens and closes in order to allow for the flow of blood from the right atrium of the human heart to the right ventricle. Also, the right atrioventricular valve is saddled with the responsibility of preventing blood from flowing backward in the mammalian heart.
Hence, the valve which is between the Right Atrium and ventricle is the right atrioventricular valve (AV).
Answer:
C - Muscle
Explanation:
Option A is part of the body. Flexibility involves almost the entire body.
And option B is just soft pieces of bone, so it’s not exactly the definition of flexibility (I think).
Option C is the most reliable answer in this question, so C is the correct answer.
B is correct being tired does make it harder to have a good attitude
