Answer:
BLOOD PATHWAY:
Body > superior and inferior vena cava > right atrium > tricuspid valve > right ventricle > pulmonary semilunar valve > pulmonary artery > lungs > pulmonary vien > left ventricle > bicuspid/mitral valve> left ventricle > Aortic semilunar valve > Aorta > Body
The pathway goes like this:
From the body (we don't say first because this is a cycle), unoxygenated blood collected goes to the heart via the <u>INFERIOR and SUPERIOR VENA CAVA</u> then it empties into the <u>RIGHT ATRIUM</u> from there it passess through a valve called <u>TRICUSPID</u> valve, which prevents backflow of blood to the right atrium. The blood goes to our first pumping chamber, <u>RIGHT VENTRICLE. </u> The right ventricle pumps the blood through the <u>PULMONARY SEMILUNAR VALVE</u> which leads to the <u>PULMONARY ARTERIES</u>, which happens to be the only arteries that carry unoxygenated blood. From there it goes to the lungs to pick up oxygen and rid itself of carbon dioxide. The blood then goes back into the heart via the <u>PULMONARY VEINS</u> and like the latter, they are the only veins that carry oxygenated blood.
The blood then goes back into the heart, emptying into the <u>LEFT ATRIUM. </u> From there it goes through the <u>BICUSPID VALVE or MITRAL VALVE</u> and to the last and thickest pumping chamber, the <u>LEFT VENTRICLE.</u> The left ventricle pumps the blood through the <u>AORTIC SEMILUNAR VALVE</u> which opens out to the <u>AORTA. </u>
And at last, it goes back to your body.
Q1. The answer is 400x.
To calculate the magnification (M), you just need to multiply the objective power (O) and the ocular lens power (OL): M = O * OL
It is given:
O = 40 times
OL = 10 times
Thus,
M = O * OL = 40 * 10 = 400
Thus, the magnification of the specimen is 400 times.
Q2. The answer is transmission electron microscope.
A compound light microscope and dissecting microscope are not useful in observing structures inside the cells because they have not as high resolution as a scanning electron microscope and a transmission electron microscope.However, the scanning electron microscope enables to see structures on the surface of the objects and it would not be possible to look at the internal structures of the cell. On the other hand, the transmission electron microscope allows studying a very thin cross-section of the cell. It is best for looking at internal structures of the cell.
Q3. The answer is: have higher resolution that allows you to view smaller specimens.
The magnification of electron microscopes is up to 1,000,000 times while compound light microscopes have the magnification up to 1,500 times. This means that the electron microscopes allow you to view smaller specimens and provide you higher resolution. Regarding the other choices - they are very expensive and allow you to view only dead specimens in black and white images.
Answer: They are called Moraines
Explanation: A glacier is a large body of ice originating from land that constantly moves slowly over land. It occurs in almost all parts of the world and makes up about 3/4 of fresh water all over the world.
Glaciers constantly move on land and they do this under their own weight.
As a glacier moves across land, it pushes soil and rocks in front of it and to the sides of it.
The resulting hill formed as a result of this soil movement is called a Moraine.
A moraine is sometimes referred to as a glacial till. It is an accumulation of materials (usually soil and rock) left behind by a moving glacier.
The cost should be:
2.50 + (19 x 0.40) = 2.50 + 7.60 = $10.10
