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xxMikexx [17]
3 years ago
8

How many muscle cells are in the heart?

Health
1 answer:
natulia [17]3 years ago
5 0

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:

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Jenna's company allows occasional personal use of work computers or phones as long as it isn't "excessive" or "inappropriate." W
-BARSIC- [3]

Answer:

D. call your doctor to you be late an appointment after I work

Explanation:

Firstly,to everyone you health should be your upmost paurity. Secondly, no matter how dedicated you are to your boss ,to him it is his duty for all his staff are well and ready for work or it might affect his reputation towards his work and business associate

4 0
2 years ago
The breathing process is controlled by the what
olasank [31]
The breathing process is controlled by the central nervous and respiratory systems. Hope I helped ^-^
7 0
3 years ago
Read 2 more answers
What takes place when you inhale and exhale
Hatshy [7]
Breathing In (Inhalation)

When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.

As your lungs expand, air is sucked in through your nose or mouth. The air travels down your windpipe and into your lungs. After passing through your bronchial tubes, the air finally reaches and enters the alveoli (air sacs).

Through the very thin walls of the alveoli, oxygen from the air passes to the surrounding capillaries (blood vessels). A red blood cell protein called hemoglobin (HEE-muh-glow-bin) helps move oxygen from the air sacs to the blood.

At the same time, carbon dioxide moves from the capillaries into the air sacs. The gas has traveled in the bloodstream from the right side of the heart through the pulmonary artery.

Oxygen-rich blood from the lungs is carried through a network of capillaries to the pulmonary vein. This vein delivers the oxygen-rich blood to the left side of the heart. The left side of the heart pumps the blood to the rest of the body. There, the oxygen in the blood moves from blood vessels into surrounding tissues.

(For more information on blood flow, go to the Health Topics How the Heart Works article.)

Breathing Out (Exhalation)

When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the chest cavity.

As the space in the chest cavity gets smaller, air rich in carbon dioxide is forced out of your lungs and windpipe, and then out of your nose or mouth.

Breathing out requires no effort from your body unless you have a lung disease or are doing physical activity. When you're physically active, your abdominal muscles contract and push your diaphragm against your lungs even more than usual. This rapidly pushes air out of your lungs.

The animation below shows how the lungs work. Click the "start" button to play the animation. Written and spoken explanations are provided with each frame. Use the buttons in the lower right corner to pause, restart, or replay the animation, or use the scroll bar below the buttons to move through the frames.
8 0
2 years ago
Read 2 more answers
HELP PLEASEEEEEEEE!!!!!!
Alexxx [7]

The answer is the fight or flight response.

The fight or flight response is a survival mechanism in the body in the nervous system. It is how we respond to a stressful situation and is there to protect us from harm. Therefore it is not a risk factor for violence. It's our bodies natural way to protect us from violence.

The other choices are sadly all risk factors for violence.

6 0
3 years ago
Which 4 of the following would be considered Moderate or vigorous physical activities?
mote1985 [20]
A, B, C, and E would be the 4 most vigorous physical activities.
6 0
2 years ago
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