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
Gennadij [26K]
3 years ago
14

Which structure of the heart is responsible for prevening blood from flowing in tthe wrong direction?

Biology
1 answer:
Sloan [31]3 years ago
8 0
The valves are responsible for preventing blood from flowing in the wrong direction, they are present in the veins, and the arteries don't need them because the aorta (biggest artery) pumps or in other words pushes it with such a force that no other force can change its direction, in the veins there is no structure present for pumping them as a result we have got valves so that they go in one direction...... the meaning of the word valve is to allow in one direction
You might be interested in
Why all vertebrae are bones but all bones are not vertebrae?
omeli [17]
Vertebrae are the scientific term for the backbones. 
All backbones are backbones... right? :'D 

However, the vertebrae are only a bone GROUP; there are other types of bones like joints, shafts and etc which don't come under the vertebrae clssification. 
6 0
3 years ago
What is the process in which species evolve in response to changes in each other?
lara [203]
I believe it is behavioural isolation. When there are changes within a certain species, e.g. new birdcalls are formed in certain individuals in a species, "traditional" birds may not like such mating calls and only choose to mate with the more common birdcalls from majority of the birds. There are also some birds that may like the new birdcalls, and choose to mate with birds with those birdcalls. They become genetically isolated as they continue such behavior. Eventually, through genetic drift and other mutations, different species form from a single specie.

Hope this helps! :)
5 0
3 years ago
The data indicate the populations of mammals in the Florida Everglades in different years over the past two decades. The Burmese
Oduvanchick [21]

Answer:

The correct hypothesis would be - C) Burmese pythons lack natural predators and can utilize a wide variety of food sources in the Everglades.

Explanation:

Burmese pythons are the invasive species in this new region as they originally found in South Africa, and also one of the largest snakes so they lack natural predators in this new setting or region.

These snakes depend on both types of food which means they are omnivorous and eat both herbivore and carnivores prey.

Thus, the correct answer is - Burmese pythons lack natural predators and can utilize a wide variety of food sources in the Everglades.

8 0
3 years ago
The top sequence is A G C T G T.
riadik2000 [5.3K]

Answer:

substitution

Explanation:

5 0
3 years ago
The cell membranes of Antarctic ice fish might have which of the following adaptations? a. a high percentage of unsaturated fatt
zubka84 [21]

Answer:

c. a high percentage of very long chain saturated fatty acids

Explanation:

Saturated fatty acids do not have double bonds (they are saturated with hydrogens), so their tails are relatively straight. Unsaturated fatty acids, on the other hand, contain one or more double bonds, which often produces an elbow or bend. (You can see an example of an unsaturated bent tail in the phospholipid structure diagram that appears at the beginning of this article.) Saturated and unsaturated phospholipid fatty acid tails behave differently when the temperature drops:

- At colder temperatures, the straight tails of saturated fatty acids can be tightly bound, producing a dense and quite rigid membrane.

- Phospholipids with unsaturated fatty acid tails cannot bind so closely due to the bent structure of their tails. For this reason, an unsaturated phospholipid membrane remains fluid at lower temperatures than a saturated phospholipid membrane.

Most cell membranes contain a mixture of phospholipids, some with two saturated (straight) tails and others with a saturated tail and an unsaturated (folded) tail. <u>Many organisms — fish, for example — can adapt physiologically to cold environments by changing the proportion of unsaturated fatty acids in their membranes, that is, increasing the proportion of saturated long-chain fatty acids.</u>

In addition to phospholipids, animals have an additional component in their membrane that helps them maintain fluidity. Cholesterol, another type of lipid that is embedded between the membrane phospholipids, helps decrease the effects of temperature on fluidity.

8 0
3 years ago
Other questions:
  • 1. Scientists believe that ancient ancestors of all animals were (1 point) A) single-celled prokaryotes that reproduced asexuall
    15·2 answers
  • The kidney is referred to as an excretory organ because it excretes __1__ wastes. it is also a major homeostatic organ because i
    14·1 answer
  • What type of plate boundary could form a mountain chain of sedimentary rock? PLEASE ANSWER NOW 
    11·1 answer
  • In Earth’s mantle, heat is transferred in large convection currents. within these currents,
    10·1 answer
  • To survive hunter-gatherers changed their environment bya.Burning the prairies to prevent trees from growing.B.Spreading plants
    7·1 answer
  • Similarities between mitosis and meiosis (as many as possible, I really need help)
    5·1 answer
  • Never mind wrong print
    15·1 answer
  • Ina concludes that color does influence the attraction of butterflies and moths do you think this is a logical conclusion
    7·2 answers
  • Kenneth and Catherine Lohmann of the University of North Carolina explored the orientation or direction-finding abilities of log
    8·1 answer
  • WORTH 15 PTS PLEASE HURRY For each statement indicate (with the letter) which of the following (A-E) fits best:
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!