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Sveta_85 [38]
3 years ago
9

Which of the following is the correct sequence of blood flow in birds and mammals? A. vena cava → right atrium → right ventricle

→ pulmonary vein. B. vena cava → left atrium → left ventricle → pulmonary artery. C. left ventricle → aorta → lungs → systemic circulation. D. vena cava → right atrium → right ventricle → pulmonary artery
Biology
1 answer:
Stels [109]3 years ago
5 0

Answer:

D. vena cava → right atrium → right ventricle → pulmonary artery

Explanation:

This is an example of pulmonary circuit.

Venae cavae are a vessels (vena cava interior and superior) that carriy deoxygenated blood from the body to the  right atrium. From the right atrium through the tricuspid valve the blood goes into the right ventricle. Then, from the right ventricle through the pulmonary valve the blood goes into the main pulmonary artery which carries deoxygenated blood to the lungs (to recieve oxygen).

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Answer:

Pulse Pressure

As shown in Figure 1, the difference between the systolic pressure and the diastolic pressure is the pulse pressure. For example, an individual with a systolic pressure of 120 mm Hg and a diastolic pressure of 80 mm Hg would have a pulse pressure of 40 mmHg.

Generally, a pulse pressure should be at least 25 percent of the systolic pressure. A pulse pressure below this level is described as low or narrow. This may occur, for example, in patients with a low stroke volume, which may be seen in congestive heart failure, stenosis of the aortic valve, or significant blood loss following trauma. In contrast, a high or wide pulse pressure is common in healthy people following strenuous exercise, when their resting pulse pressure of 30–40 mm Hg may increase temporarily to 100 mm Hg as stroke volume increases. A persistently high pulse pressure at or above 100 mm Hg may indicate excessive resistance in the arteries and can be caused by a variety of disorders. Chronic high resting pulse pressures can degrade the heart, brain, and kidneys, and warrant medical treatment.

Mean Arterial Pressure

Mean arterial pressure (MAP) represents the “average” pressure of blood in the arteries, that is, the average force driving blood into vessels that serve the tissues. Mean is a statistical concept and is calculated by taking the sum of the values divided by the number of values. Although complicated to measure directly and complicated to calculate, MAP can be approximated by adding the diastolic pressure to one-third of the pulse pressure or systolic pressure minus the diastolic pressure:

\displaystyle \text{MAP}=\text{diastolic BP}+\frac{(\text{systolic}-\text{diastolic BP})}{3}MAP=diastolic BP+

​3  

Pulse

After blood is ejected from the heart, elastic fibers in the arteries help maintain a high-pressure gradient as they expand to accommodate the blood, then recoil. This expansion and recoiling effect, known as the pulse, can be palpated manually or measured electronically. Although the effect diminishes over distance from the heart, elements of the systolic and diastolic components of the pulse are still evident down to the level of the arterioles.

This image shows the pulse points in a woman’s body.

Figure 2. The pulse is most readily measured at the radial artery, but can be measured at any of the pulse points shown.

Because pulse indicates heart rate, it is measured clinically to provide clues to a patient’s state of health. It is recorded as beats per minute. Both the rate and the strength of the pulse are important clinically. A high or irregular pulse rate can be caused by physical activity or other temporary factors, but it may also indicate a heart condition. The pulse strength indicates the strength of ventricular contraction and cardiac output. If the pulse is strong, then systolic pressure is high. If it is weak, systolic pressure has fallen, and medical intervention may be warranted.

Pulse can be palpated manually by placing the tips of the fingers across an artery that runs close to the body surface and pressing lightly. While this procedure is normally performed using the radial artery in the wrist or the common carotid artery in the neck, any superficial artery that can be palpated may be used. Common sites to find a pulse include temporal and facial arteries in the head, brachial arteries in the upper arm, femoral arteries in the thigh, popliteal arteries behind the knees, posterior tibial arteries near the medial tarsal regions, and dorsalis pedis arteries in the feet. A variety of commercial electronic devices are also available to measure pulse.

Explanation:

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A ball was kicked by a player, the ball was stationary, then it gains a velocity of 5 m/s North. Did the ball accelerate or no?
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Answer:

Yes, it accelerates

Explanation:

We have that:

The ball was stationary implies that its initial velocity, u = 0

It gained 5m/s means that its final velocity, v = 5m/s

Using first law of newton, we can determine whether it accelerates or not.

v = u + at

Substitute values for v and u

5 = 0 + at

5 = at

Make a the subject

a= \frac{5}{t}

<em>This implies that the ball accelerates over a period of time t</em>

<em></em>

Another way to tell if it accelerates or not is to consider the change in velocity.

When there is an increment in velocity of an object, the object accelerates.

In this case, the velocity increases from 0 to 5. Hence, we can conclude that it accelerates

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