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
Svet_ta [14]
3 years ago
14

Functional Magnetic Resonance Imaging is a tool that has been very useful in identifying what parts of the brain do what. Scient

ists can have a person perform some particular activity and then look for active areas in the brain. How does fMRI work?
A. It takes a picture of the inside of the brain according to electricity levels. The more electrical current in the area, the more active it is.
B. It takes a picture of the inside of the brain according to blood flow. More blood flow indicates more activity in that area.
C. It takes images of thin layers of the brain and the more electrical activity in a layer, the more magnetic it is and this shows up in fMRI.
D. Electrodes attached to the skull can trigger activity in particular brain areas which then trigger a person to perform certain behaviors.
E. It takes a picture of the brain according to oxygen levels. More oxygen in an area indicates more activity in that area.
Biology
1 answer:
Ne4ueva [31]3 years ago
4 0

Answer:

E. It takes a picture of the brain according to oxygen levels. More oxygen in an area indicates more activity in that area.

Explanation:

Haemoglobin is diamagnetic when oxygenated but paramagnetic when deoxygenated. This distinction in magnetic characteristics leads to tiny variations in the blood MR signal. Since blood oxygenation differs, these variations can be used to identify brain activity depending on the concentrations of neural activity.

You might be interested in
When organic matter in soil decomposes, it creates a layer called _____?
elixir [45]

When the organic matter in soil decomposes, it creates a layer called topsoil.


3 0
3 years ago
Name 15 different types of sharks and write one sentance that describe each!
baherus [9]
15 types of sharks:


#1   Hammerhead Shark

#2   Wobbegong

#3   Sand Shark

#4   SawShark

#5   Angelshark

#6   Cat Shark

#7   Cow Shark

#8   Brambleshark

#9   Carpet Shark

#10   Alopias

#11   Carcharhiniformes

#12   <span>Heterodontus
</span>
#13   <span>Squaliformes
</span>
#14   Hexanchiformes

#15   Smooth-hound

Sentences:


#1   A Hammerhead shark is a type of shark that comes from the family, Sphyrnidae. These sharks were named for their head shape, <span>which are flattened and laterally extended into a "hammer" shape.

#2   The Wobbegong shark is known as a type of carpet shark and is </span>found mostly in the shallow temperate and tropical waters of the western Pacific Ocean. As well as in the Eastern Indian Ocean.

#3   Sand Sharks come from the Odontaspididae family. These sharks can be found world wide, and mostly in tropical waters. It can also be known as the Sand Tiger Shark in both the US and in the UK.<span>

#4   The Sawshark has a l</span><span>ong, saw-like rostrum edged with sharp teeth. They use this to slash and disable their prey.

#5   An Angelshark contains a flattened body and wide </span><span>pectoral fins, that offten give them a strong resemblance to rays.

#6   The Cat shark can also be refered to as the Bamboo shark. This species finds comfort in swing very close to the ground.

#7   Cow Sharks belong in the </span><span>Hexanchidae family because of their additional pair of gill sets.

#8   The Bramble shark can be found in the </span><span>eastern Pacific Ocean, and in tropical and temperate waters worldwide.

#9   A Carpet shark can commonly be mistaken for a Wobbegong shark, although they can sometimes be the length of a whale shark.

#10   The Alopias shark can also be known as a Thresher shark and has the ability to</span> <span>inhabit both coastal waters and oceans far from land, from the surface to depths of at least 360 meters.

#11   The </span><span>Carcharhiniformes shark can also be known as a ground shark and they can weigh as much as a Bull shark.

#12   The Heterodontus is a bull shark </span><span>that is a small order of basal modern sharks. </span><span>

#13   </span>Sharks in the Swualiformes family, have two dorsal fins, which usually possess spines.

#14   The <span>Hexanchiform shark has only one dorsal fin and six or seven gill slits. This species is extinct.

#15   The Smooth-Hound Shark is narrow finned and is sometimes referred to as the </span>Florida smooth-<span>hound.


Sorry this took me so long to complete. It was a lot!!

Hope this helps!!</span>
3 0
4 years ago
1. Populations can have variety, despite being made up of the same species. If a population has different expressed traits, this
fgiga [73]
Natural Selection proposes that organisms that are better adapted to their environment are able to survive and reproduce.

Even though these frogs are the same species, their shades of green is what helps them to survive in their habitat. In this case, frogs with a lighter shade of green are able to be seen by predators easier, whereas frogs with darker shades are able to blend in (camouflage) more with their surroundings. After a period of time, due to them being easily seen, lighter-shaded green frogs will die off.

To anseer your question, natural selection would have a gradual affect on the frequency of the alleles. Lighter-green allele frequencies would eventually cut off, and darker-green allele frequencies will increase.

Hopefully the following image will help:
As seen in the image, (please forgive the quality, as I had drawn this on some random kids drawing site on the internet...) you can see the affects of natural selection on the allele frequencies. The brighter-green shades gradually decrease over time, as the darker shades increase.

Hope you find this helpful.

8 0
3 years ago
Which human activity would help preserve our natural resources? *
Temka [501]
C. recycling
the rest are destroying the earth
8 0
3 years ago
Read 2 more answers
Please answer fast I,m in a hurry... In the skeletal system What parts of the system process the input?
bazaltina [42]
Http://www.livescience.com/22537-skeletal-system.html
5 0
3 years ago
Other questions:
  • During which stage of a thunderstorm does the most precipitation fall
    15·1 answer
  • What is the FITT principle?​
    13·1 answer
  • Jan noticed that when she put a tomato in water, it sank. When she put an apple in water, it floated. Why did the tomato sink wh
    7·1 answer
  • The mature form of a newly discovered species of eukaryote contains 12 chromosomes and exists in
    7·1 answer
  • What are three characteristics of scientific ideas?
    10·1 answer
  • What type of rock is pictured here?
    6·2 answers
  • Where do echinoderms live?
    13·2 answers
  • A dog pants in the heat to control its body temperature. Panting is a mechanism of that dog use for .
    9·2 answers
  • Radio waves, infrared waves, visible light, and Xrays are all forms of energy
    6·1 answer
  • What do the Neuron and Epithelial Cells have in common?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!