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
horsena [70]
3 years ago
13

Damaged tissue releases chemicals that activate platelets and stimulate the formation of blood clots. Which of the following pre

dictions about the activity of platelets best describes a positive feedback mechanism?
A. Activated platelets release chemicals that inhibit blood clot formation.
B. Activated platelets release signaling molecules that inhibit cell division in damaged tissue.
C. Activated platelets constrict the blood vessels, stopping blood flow.
D. Activated platelets release chemicals that activate more platelets.
Biology
1 answer:
Artemon [7]3 years ago
8 0

Answer:

D. Activated platelets release chemicals that activate more platelets.

Explanation:

When a stimulus or a change in some condition triggers a response that intensifies the changing condition, the mechanism is called a positive feedback mechanism.

Any damage to tissues makes the platelets to contact and stick to parts such as collagen fibers of the connective tissue present under the damaged endothelial cells. This process of platelet adhesion activates the platelets and brings about changes in them. The activated platelets grow many projections to contact and interact with one another. They also release ADP and thromboxane A2 which in turn activates the nearby platelets. The ADP makes other platelets in the area sticky. The stickiness of the newly recruited and activated platelets causes them to join the originally activated platelets. Eventually, the accumulation and attachment of large numbers of platelets form a platelet plug.

Here, release of chemicals from the activated platlets to activate more platlets represents the positive feedback mechanism.

You might be interested in
What is menopause, and why does it occur?
katovenus [111]

Answer:

A woman is born with all of her eggs, which are stored in her ovaries. The ovaries also make the hormones estrogen and progesterone, which control her period (menstruation) and the release of eggs (ovulation). Menopause happens when the ovaries no longer release an egg every month and menstruation stops.

5 0
3 years ago
Read 2 more answers
I actually need so much help with this, I’ll give extra points just PLEASE HELP
suter [353]
#2 is an exponential graph, #3 is linear horizontal, #4 is like graph 1, #5 is linear upwards but slowly, #6 like number 5, #7 like number 1, #8 like number 1
6 0
3 years ago
Isotopes that release energy in the form of radiation are
AveGali [126]
The answer is c because curies release energy from the radiation
7 0
3 years ago
Read 2 more answers
Plz i need help!!! List three factors that help form global winds.
guajiro [1.7K]

Answer:

Global winds are affected by convection current, pressure gradients, the Coriolis effect, and friction.

Explanation:

6 0
3 years ago
Read 2 more answers
Describe the structure of alveolus which is known as tha breating organ.
Dovator [93]
The alveolus (singular form) or alveoli (plural form) are tiny sacs of organs that are attached to the ends of the alveolar duct. These tiny sacs of air are clumped together that form interconnected caves, working together as a unit. They are found inside the lungs and they make the exchange of air easy and possible. Alveoli units are responsible for putting oxygen into the air that we breathe in. Blood that passes through the heart and into the lungs are converted into oxygen which will be then transported by the blood all over the body systems.  
<span>
The walls of the alveoli are extremely thin to enable the quick exchange of gases Aside from this, the linings of alveoli units are fluid in nature enabling gases to dissolve.  </span>
5 0
4 years ago
Other questions:
  • What conclusion can you draw from the population pyramid?
    7·2 answers
  • Biological classification how are organisms grouped sorted and classified answers key
    6·1 answer
  • What does the water lakes come from? Three correct answers
    12·2 answers
  • The hydrologic, carbon, nitrogen, and phosphorus cycles are essential to the . This is why they are called biogeochemical cycles
    9·1 answer
  • Need help Plz!!!!
    5·1 answer
  • The nonpolar tails of a phospholipid are *attracted* to water
    7·1 answer
  • What is the relationship between force, mass, and motion?
    9·1 answer
  • What is one way during the G0 phase that a mistake during the cell cycle could result in problens for the G0 phase?​
    8·1 answer
  • Petra is working on a project that is looking for ways to improve milk yield in cows. What is Petra's job title?
    15·2 answers
  • Fast helpppppp
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!