Answer:
a. QRS
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.
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.
The QRS complex represents the time necessary for the impulse to travel through the bundle of His, the bundle branches, and the Purkinje fibers to complete ventricular activation or contraction, known as ventricular depolarization. QRS is simply a combination of the Q-wave, R-wave and the S-wave which represents electrical impulses.
Fat contains nine kilocalories per gram.
These things can lead to people feeling those certain feelings
Depression
Anxiety
Stress
Not enough nutrients
Sleep deprived
I had to do this too when i was in middle school;
Number 1, I said that their are many local gyms and fitness centers, healthy restaurants, and clinics that help your health, and one way you can say that you are experienced with one of them is by going to a gym or eating at a certain place before, or even shopping at a clinic.
For number 2, you can motivate yourself past and distractions by staying positive, paying attention by putting more focus on what your working on, eliminating distractions like your cellphone or devices, or anything that is unnecessary for what you are working on, and not letting others in the classroom or work environment distract you.
Good luck, hope this helps!! :)
