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Be able to describe the cardiac cycle using the appropriate chambers, valves, and vessels. What are the stages of the cardiac cy

Natasha_Volkova [10]

Answer:

The heart beat sequence is the sequence of events that occurs when the heart beats. As the heart beats, blood circulates through the pulmonary and systemic circuits of the body. There are two stages of the heart beat cycle: the diastole phase and the systole phase. In the diastole phase, the ventricles of the heart relax and the heart fills with blood. In the systole phase, the ventricles contract and pump blood from the heart to the arteries. A cardiac cycle is completed when the chambers of the heart fill with blood and blood from the heart is pumped.

Explanation:

1. Ventricular Diastole

For the period of ventricular diastole, the atria and ventricles of the heart are relaxed and the atrioventricular valves are open. The oxygen-free blood that returns to the heart from the body after the last cardiac cycle passes through the superior and inferior cava veins and flows into the right atrium.

Open atrioventricular valves (tricuspid and mitral) allow blood to pass through the atria into the ventricles. The impulses of the sinoatrial node (SA) travel to the atrioventricular node (AV) and the AV node sends a signal that triggers the contraction of both atria. As per a result of this reduction, the right atrium empties its contents into the right ventricle. The tricuspid valve, located between the right atrium and the right ventricle, prevents blood from flowing into the right atrium.

2. Ventricular Systole

At the beginning of the ventricular systole period, the right ventricle, which is full of blood that passes from the right atrium, receives impulses from the fiber branches (Purkinje fibers) that carry electrical impulses that cause it to contract. When this occurs, the atrioventricular valves close and the semilunar valves (pulmonary and aortic valves) open.

Ventricular contraction causes oxygen depleted blood from the right ventricle to be pumped into the pulmonary artery. The pulmonary valve prevents blood from returning to the right ventricle. The pulmonary artery carries deoxygenated blood along the pulmonary circuit to the lungs. Here, the plasma gathers oxygen and returns to the left atrium of the heart through the pulmonary veins.

3. Atrial Diastole

In the period of atrial diastole, semilunar valves close and atrioventricular valves open. Oxygenated blood from the pulmonary veins fills the left atrium, while blood from the vena cava fills the right atrium. The SA node contracts again, causing both atria to do the same.

in the next step of process, atrial contraction causes the left atrium to empty its contents into the left ventricle and the right atrium to empty its contents into the right ventricle. The mitral valve, located between the left atrium and the left ventricle, prevents oxygenated blood from returning to the left atrium.

4. Atrial Systole

During the period of atrial systole, the atrioventricular valves close and the semilunar valves open. The ventricles receive impulses to contract. Oxygenated blood in the left ventricle is pumped into the aorta and the aortic valve prevents oxygenated blood from returning to the left ventricle. The oxygen-depleted blood is also pumped from the right ventricle to the pulmonary artery at this time.

The aorta branches to provide oxygenated blood to all parts of the body through systemic circulation. After its journey through the body, deoxygenated blood returns to the heart through the vena cava.

4 0

4 years ago

Chronic obstructive pulomonary diseases (COPD), include:

KIM [24]

Answer:

The correct answer to the question: Chronic Obstructive Pulmonary diseases (COPD), include:____, would be, D: a and b are correct.

Explanation:

COPD, or best known as Chronic Obstructive Pulmonay Disorder, is the general name given to a disease in which the lungs are incapable of performing their task of oxygen and carbon dioxide exchange, because of an obstruction either of the airways, or the alveoli, which are the sacks in which the actual exchange takes place. This obstruction can happen either because of an overproduction of mucus, or because the airways become fibrous, and therefore, oxygen cannot be exchanged. The other reason is when the alveoli are damaged and destroyed and air sacks form in the lungs. In COPD, we have two types: Chronic Bronchitis, in which due to continuous coughing, and mucus production, the bronchi become inflamed and fibrous and therefore exchange is much more difficult. In the second form, we have emphysema, in which the constant coughing starts affecting the lining of the alveoli, until it can literally be destroyed and pockets of air can form inside the actual lung tissue.

6 0

3 years ago

The nurse is planning care for elderly clients on the psychiatric unit. Which statement best reflects an expected reaction to me

Inessa [10]

1. Increased tactile responsiveness
2. Increased sensitivity to visual glare
3. Increased hearing acuity for higher tones
4. Increased thoracic expansion during ventilation
Increased sensitivity to visual glare

6 0

3 years ago

Suzanne was diagnosed with lymphocytopenia. Lymphocytes are white blood cells, so which best describes Suzanne’s condition?

Lemur [1.5K]

Answer:

C. Low levels of white blood cells

3 0

3 years ago

A client has presented to the clinic reporting various symptoms indicating she may have fibroids in her uterus. which client sym

anygoal [31]

b.) Low back pain ; d.) Dyspareunia ; c.) Menorrhagia , a.) bloating are the client symptoms would the nurse expect.

Noncancerous uterine growths known as uterine fibroids are common during the childbearing years. Uterine fibroids, also known as leiomyomasbor myomas, don't enhance the risk of uterine cancer and hardly ever turn cancerous.

Many women with fibroids have no symptoms at all. The location, size, and quantity of fibroids in individuals who do can affect symptoms. The most typical uterine fibroids symptoms and indicators in women who experience them are as follows:

extreme menstrual bleeding
longer than a week's worth of menstrual cycles
Pelvic pressure or discomfort
often urinating
bladder emptying challenge
Constipation
Leg or back discomfort

Here is another question with an answer similar to this about fibroids: brainly.com/question/20030284

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Question correction:

A client has presented to the clinic reporting various symptoms indicating she may have Fibroids in her uterus Which client symptoms should the nurse expect ? (Select all that apply)

a.) bloating

b.) low back pain

c.)menorrhagia

d.)dyspareunia

e.)diarrhea

6 0

1 year ago