Answer:
The human heart contains an estimated 2–3 billion cardiac muscle cells, but these account for less than a third of the total cell number in the heart.
Explanation:
He could run outside around your neighbourhood or in a nearby park for an hour, make sure to eat less fatty and unhealthy food, eat more fruits and healthier meals. Also he could eat smaller portion sizes and drink plenty of water. If you can go to a nearby gym and do some exercises there
:)
Hope it works out for him
The lungs recoil to force the air out of the lungs. The intercostal muscles relax, returning the chest wall to its original position. The diaphragm also relaxes, moving higher into the thoracic cavity.
Incomplete question. The remaining part read;
<u>Words</u>
- Carbon Dioxide
- Cell wastes
- Food
- Oxygen
Answer:
<u>Arrow 1: Food</u>
<u>Arrow 2: Oxygen</u>
<u>Arrow 3: Cell wastes</u>
<u>Arrow 4: Carbon dioxide</u>
<u>Arrow 5: Water</u>
