1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ghella [55]
3 years ago
8

1. Write a paragraph of 3-5 sentences to answer the following question. Your answer should demonstrate an understanding of the i

mportant physiological terms and concepts in the question, and be thoughtfully and professionally written. You have been sitting on a plane for six hours without moving. Blood has been pooling in your veins. When you stand up, you feel dizzy. Why do you think this is? Include in your answer a discussion of stroke volume and mean arterial pressure. (Hint: dizziness is often due to reduced blood flow to the brain.)
Biology
1 answer:
nignag [31]3 years ago
6 0

Answer:

When you sit on a plane for 6 hours without moving, blood accumulates in your veins, and the moment you get up, gravitational forces affect venous return, cardiac output, blood pressure, and venous pressure. That way, when you're sitting on a plane, the gravitational force is the same at the upper and lower extremities, such as the chest, abdomen, and legs, causing venous blood pressure and volume to be evenly distributed throughout the body. However, when one gets up, one becomes dizzy because of abnormal regulation of blood pressure. This is because gravity causes blood to accumulate in the lower extremities (veins of the legs and trunk). This lowers the blood pressure and the blood that the heart pumps. By causing blood to accumulate in the lower extremities, and as venous compliance increases, the veins expand with blood that causes the volume of blood to shift in the veins. This increases the volume and venous pressure in the lower extremities when standing. And the volume of thoracic venous blood is less and less central venous pressure. This leads to a decline in stroke volume. Cardiac output and mean arterial pressure also decrease as left ventricular stroke volume decreases, reducing pulmonary venous return. Decreased standing blood pressure, referred to as orthostatic or postural hypotension. Thus, lowering blood pressure decreases cerebral blood flow, which means less range of blood in the brain causing dizziness.

Explanation:

You might be interested in
What are some examples of bacterias?​
kogti [31]

Answer:

protozoa

amoeba

have a nice day

4 0
3 years ago
When the Na+ gates open what floods out of the muscle fiber?
choli [55]

Answer:

NA+ gates open and flow into the Sarcolemma of the muscle fiber.

7 0
2 years ago
The resolving power of the earliest electron microscopes was at least ten times higher than that of the light microscopes, mainl
ki77a [65]

The resolving power of the earliest electron microscopes was at least ten times higher than that of the light microscopes, mainly because the wavelength of electrons is much shorter than the wavelength of light.

The electron microscope uses a beam of accelerated electrons to magnify the object whereas the light microscope uses visible light for this purpose. Unlike the light microscope, the electron microscope uses electromagnets as lenses.

The magnification of the electron microscope is much higher as compared to the light microscope and it produces high-resolution images. However, the Specimen preparation of an electron microscope takes several days while the Specimen preparation of the light microscope takes only a few minutes.

If you need to learn more about electron microscopes, click here

brainly.com/question/2437983?referrer=searchResults

#SPJ4

6 0
1 year ago
What is the name of the hormone that brings about the breakdown of juvenile features in insects​
MrRa [10]
Throughout the young larval stages a small gland behind the brain, called the corpus allatum, secretes juvenile hormone (also known as neotenin).
3 0
3 years ago
True or False: Most cells show asymmetric organization or polarity. In eukaryotic cells, polarity is often the result of the mic
Pani-rosa [81]
True??? I think u don’t need to put the answer I gave u but it’s just my thought
4 0
3 years ago
Other questions:
  • he picture shows a series of reactions in a biochemical pathway. Which of these is CORRECT for this cycle?
    7·2 answers
  • Some plants respond to light with a sudden enlargement of their leaf pores. this response is important because it enables the pl
    5·1 answer
  • Cloning results in two organisms that are...
    9·2 answers
  • The intervening age between childhood and puberty​
    12·1 answer
  • NEED HELP QUICK!!
    10·1 answer
  • 2. The form of oxygen that combines three oxygen atoms into each molecule is called 1argon.thermopausechlorofluorocarbonOZoneE 3
    9·2 answers
  • A liquid that is being heated at Lakesha’s lab table catches fire. Which action should Lakesha take first?
    13·2 answers
  • 48.Which is a significant environmental cost of burning fossil fuels that is not incurred with the use of the other energy resou
    14·1 answer
  • PLEASE I NEED HELP ILL GIVE BRAINIEST !!!!
    6·2 answers
  • The role of bacteria and mushrooms is that of __.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!