16th October 2019

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15

What happens when you inhale and exhale?

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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.

Keeping this in view, what causes the diaphragm to contract?

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.

Is the diaphragm flat when relaxed?

When we inhale, the diaphragm contracts and is drawn inferiorly into the abdominal cavity until it is flat. During exhalation, the rib cage drops to its resting position while the diaphragm relaxes and elevates to its dome-shaped position in the thorax.

What happens to the diaphragm during expiration?

This happens due to elastic properties of the lungs, as well as the internal intercostal muscles which lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air.

1

What is carried in the plasma?

Plasma is a straw-coloured liquid. It transports dissolved substances around the body, including: hormones. nutrients, such as water, glucose, amino acids, minerals and vitamins.

2

Which muscles help in breathing?

The diaphragm is attached to the base of the sternum, the lower parts of the rib cage, and the spine. As the diaphragm contracts, it increases the length and diameter of the chest cavity and thus expands the lungs. The intercostal muscles help move the rib cage and thus assist in breathing.

3

Why do you breathe?

– We breathe to get oxygen to our cells so that they can use oxygen to make cellular energy (ATP). Cells do this by completely breaking down glucose (sugar) into carbon dioxide (which you breathe out) and water.

4

What do we breathe in and out?

When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat. The carbon dioxide is dissolved in the blood, carried to the lungs by the circulation, and breathed out.

5

Is the process of breathing voluntary or involuntary?

Breathing is special in several respects: it is the only function you can perform consciously as well as unconsciously, and it can be a completely voluntary act or a completely involuntary act, as it is controlled by two sets of nerves, one belonging to the voluntary nervous system, the other to the involuntary (

6

What allows oxygen to pass into your blood?

Oxygen and carbon dioxide move from where there is a large concentration to where there is a lower concentration. This movement is called diffusion. Oxygen diffuses from the alveoli, into the blood in the capillaries. Similarly, carbon dioxide from the blood moves out of the capillaries into the alveoli.

7

What is the diaphragm and what does it do?

The diaphragm is the primary muscle used in the process of inspiration, or inhalation. It is a dome-shaped sheet of muscle that is inserted into the lower ribs. Lying at the base of the thorax (chest), it separates the abdominal cavity from the thoracic cavity.

8

What gas passes out of the blood into the alveoli?

After passing into the many bronchioles, it finally arrives into some of the millions of tiny sacs called alveoli. This is where gas exchange takes place - oxygen passes out of the air into the blood, and carbon dioxide passes out of the blood into the air in the alveoli.

9

What happens during gas exchange in the lungs?

Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

10

What is the part of the brain that controls breathing?

The cerebrum, the cerebellum, and the spinal cord are all connected to the brainstem. The brainstem has three main parts, the midbrain, the pons, and the medulla oblongata. The brain stem controls vital functions of the body, including: Breathing.

11

How does the diaphragm move when you exhale?

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.

12

How is gas exchanged in the lungs?

The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

13

What happens to the diaphragm during expiration?

This happens due to elastic properties of the lungs, as well as the internal intercostal muscles which lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air.

14

Where is the site of gas exchange in the lungs?

Gas Exchange in the Lungs. In the lungs, oxygen and carbon dioxide (a waste product of body processes) are exchanged in the tiny air sacs (alveoli) at the end of the bronchial tubes. The alveoli are surrounded by capillaries.

15

What happens when the diaphragm contracts?

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.

16

What keep the mucus and dirt out of your lungs?

At the same time, you inhale air through your mouth and nose, and the air heads down your trachea, or windpipe. On the way down the windpipe, tiny hairs called cilia (say: SILL-ee-uh) move gently to keep mucus and dirt out of the lungs.

17

Is the diaphragm a muscle?

The diaphragm is the dome-shaped sheet of muscle and tendon that serves as the main muscle of respiration and plays a vital role in the breathing process. Also known as the thoracic diaphragm, it serves as an important anatomical landmark that separates the thorax, or chest, from the abdomen.

18

What are the steps of exhalation?

the steps of exhalation.

step.1. the intercostal muscles relax.
step.2. this causes the ribcage to move down and in.
step.3. diaphragm muscles relax and shape the diaphragm as a dome.
step.4. this causes a decrease in the volume of the rib cage and an increase in the air pressure.
step.5.
step.6.

19

Why do we sneeze occasionally?

When the diaphragm relaxes, it moves back to its normal bell-shaped position, which causes the chest cavity to shrink and push air out of the lungs. The mucus in the nostrils performs two main jobs. People sneeze if the particles caught in the mucus of the nasal cavity irritate the nose.

20

What happens within the respiratory system when someone has hiccups what can cause hiccups?

When the air rushing in hits your voice box, your vocal cords close suddenly and you're left with a big hiccup. Some things that irritate the diaphragm are eating too quickly or too much, an irritation in the stomach or the throat, or feeling nervous or excited. Almost all cases of the hiccups last only a few minutes.

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