Bio homework help :)?

If 32 packed volume units of cells are separated from 46 volume units of plasma from a blood sample, the haematocrit is _______

nordsb [41]

Answer:

If 32 packed volume units of cells are separated from 46 volume units of plasma from a blood sample, the hematocrit is <u>41,02%</u> percent. The hematocrit value is <u>within the normal</u> range.

Explanation:

Hello!

Hematocrit (or packed cell volume -PCV-)is defined as the percentage of red blood cells (vol%) in a blood sample. One common method of determining it is by centrifuging a heparinized blood sample in a capillary tube at 10 000 RPM for five minutes. This separates the blood sample in two layers, formed elements (RBC and WBC) and Plasma.

The length of the layers is directly measured from the tube and represents the volume of packed cells and plasma. Since the number of white cells is negligible compared to the number of red cells, the formed elements are considered to represent the red blood cells.

The hematocrit can be calculated as the volume of packed cells divided by the total volume of the blood sample.

$\frac{PCV}{TOTAL(pcv+plasma} * 100$

<u>In the question:</u>

$\frac{32}{32+46} * 100$ = $\frac{32}{78} * 100$ = 41,02%

In humans the normal hematocrit range is 40,7% to 50,3% for men and 36,1% to 44,3%. Taking these reference values into consideration, this sample is within the normal range.

I hope you have a SUPER day!

4 0

4 years ago

Which eras ended with a mass extinction?

-Dominant- [34]

B. Mesozoic and Paleozoic

-Good luck!

6 0

3 years ago

Suppose a population is carrying a condition controlled by two alleles: P (dominant) and p (recessive). Only homozygous individu

lions [1.4K]

Considering the question is asking only for the percentage of the P allele, then the correct answer is A - 89 percent.

This is correct because we always have a combination of 2 alleles, either PP, Pp or pp. If from all these the p allele is found only in 11% then the remaining 89% are from the P allele.

6 0

3 years ago

Scientists once believed that modern-day reptiles were the only living descendants of dinosaurs, which were reptiles. Accumulati

Mrrafil [7]

This is the complete question

Scientists once believed that modern-day reptiles were the only living descendants of dinosaurs, which were reptiles. Accumulating fossil evidence has now suggested that the most recent dinosaurs gave rise to birds, making birds one of the closest living relatives of dinosaurs.

What statement provides the strongest evidence to support the claim that birds evolved from dinosaurs?

A. A fossilized rib cage of the semi-aquatic dinosaur Spinosaurus shows that it had lungs.

B. Fossils of the beaked dinosaur Ankylosaurus show that it had modified scales that produced hard, bony plates.

(C. Fossils of the winged dinosaur Archaeopteryx show that it had modified scales that produced feathers.) c is the right answer

D. A fossilized nest of the herbivorous dinosaur Brachiosaurus shows that it laid external eggs.

The correct answer is option C, that is, fossils of the winged dinosaur Archaeopteryx show that it had modified scales that produced feathers.

<h3>What is Archaeopteryx?</h3>

Archaeopteryx is considered an intermediate fossil between the dinosaurs and modern birds.

With its amalgamation of reptilian and avian characteristics, it was long considered as the earliest known bird. It was found in 1860 in Germany, it is sometimes also called Urvogel, that is, the German term for a first bird or original bird.

Thus, The correct answer is option C.

To learn more about Archaeopteryx click here:

brainly.com/question/17059171

#SPJ1

5 0

2 years ago

Help i need it pls.<br> This is for half my grade plss help

Verdich [7]

Answer:

I think it is A, B, and C.

Explanation:

7 0

3 years ago

Read 2 more answers