BIOLOGY HIGH SCHOOL

The human body uses a number of processes to repair damage to blood vessels. After vasodilatation and prior to coagulation, a platelet plug forms: platelets adhere to exposed collagen and degranulate releasing ADP and thromboxane. These two chemicals in turn help attract more platelets to the area of damage. This is an example of: Group of answer choices negative feedback set-point regulation positive feedback endocrine control

Answers

Answer 1
Answer:

Answer:

Option C, positive feedback

Explanation:

The process described in the question is known as Platelet plug formation. In this process, after the adherence of platelet, the collagen starts binding with the platelet’s receptor thereby by activating it. After activation, platelet releases cytokines and chemical mediators such as serotonin, coagulation factors, thromboxane A2, vascular endothelial growth factor, ADP, VWF etc. Both ADP and VWF are mainly responsible for adhering nearby platelets. This is positive feedback loop because the more and more platelets are adhered; the more and more ADP and VWF levels increase.

Option C is correct

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About how many days does a human egg survive after leaving the ovaries? Select one of the options below as your answer:a. one dayb. three daysc. five daysd. seven days
A plant breeder found a species of flowering plant with very attractive flowers growing wild in a field and she thought it would appeal to her customers. Some of the plants of this species had red flowers, some white flowers, and some pink flowers. While she would like to be able to offer her customers all three colors of flowers, she only has permission from the landowner to dig up one plant to bring back to the nursery as breeding stock. What would be the best thing for her to do?A. Take a white flowering plants is the white allele could be masking the pink allele B. Tickle pink flowering plant since it is likely to carry both the red and white Alleles C. Take a red flowering plants if they could produce all three colors eventually D. Take a red flowering plants is the red Allele Is likely the dominant one
Which of the following statements accurately describes the process of dating Earth's history?a. Scientists use radiometric dating to determine the relative age of a new fossil.b. Scientists use relative dating to determine the absolute age of a new fossil.c. Scientists use radioactive isotopes to determine the absolute age of a new fossil.d. Scientists use index fossils to determine the specific years of age of a new fossil.
The most accepted theory regarding the make-up of living things is the _____. organismal theory cell theory chromosomal theory
Keystone SpeciesA keystone species is one whose presence contributes to the diversity of life and whoseextinction would lead to the extinction of other forms of life. A keystone species helps tosupport the ecosystem of which it is a part.An example of what can happen when a keystone species is removed occurred when furhunters eliminated sea otters from some Pacific Ocean kelp beds. Otters eat sea urchins,which eat kelp. With its major predator gone, sea urchin populations exploded andconsumed most of the kelp. Fish, snails, and other animals associated with the kelp bedsdisappeared.The grizzly bear is another example of a keystone species. Grizzlies transfer nutrientsfrom the ocean ecosystem to the forest ecosystem. The first stage of this transfer isperformed by salmon that swim up rivers, sometimes for hundreds of miles. Salmon are richin nitrogen, sulfur, carbon, and phosphorus. The bears capture the salmon and carry themonto dry land, scattering nutrient-rich feces (wastes) and partially eaten salmon carcasses.It has been estimated that the bears leave up to half of the salmon they harvest on theforest floor.Which sequence best represents the feeding relationships in a kelp ecosystem that has not been disturbedby humans?(1) sea urchins → kelp → fish (3) kelp → sea otters → sea urchins(2) kelp → sea urchins → sea otters (4) sea urchins → snails → kelp

The Earth is a unique planet in that it is covered by more than 70 percent water. There are several properties of water that make Earth a suitable environment for life, including how the density of solid water (ice) is about nine percent less than the density of liquid water. Which best explains why this feature of water is important for marine life?Ice forms from the bottom of the water column up, allowing organisms to freeze and enter hibernation.

Ice forms from the top of the water column down, creating a protective barrier over the liquid water.

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

The higher-density liquid water traps nutrients for primary producers better than the less-dense ice.

Answers

Answer:

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

Explanation:

    Because of this difference in density, the waters of lakes and seas do not freeze completely because a less dense ice layer forms on the surface and creates a natural thermal insulator that makes the water below it remain in the liquid phase. This saves the animal and plant life of lakes and seas.

    Ice works as a thermal insulator because its specific heat (2.03 J/g. ºC) is lower than that of water (4.18 J/g. ºC).

    After the cold is over and the hot season comes, the surface ice melts easily. But that would not happen if the ice dropped to the bottom of lakes and seas. With this, the animal and plant life would be compromised.

    Another important point is that, as already mentioned, liquid water reaches its maximum density at approximately 4ºC, which is 1,000 g/cm3. Therefore, during times such as spring and fall, the water reaches temperatures near this and becomes denser than the rest, going to the bottom. This causes a vertical movement called the convection current, which is responsible for mixing the nutrients dissolved in water.

The higher-density liquid water shelters organisms from cold air better than the less-dense ice.

The calvin cycle of photosynthesis begins when?

Answers

calvin cycle starts when the energy of light is processed to chemical energy within the cells of plants. The ATP molecules made power the Calvin cycle. The Calvin cycle utilizes energy to create carbohydrates from h20 and co2.
Begins when Light independent reactions gets the energy from sunlight to create ATP and NADPH molecules given off oxygen gas. It converts carbon dioxide into carbohydrate molecules named glucose

Meristematic cells called the _____ add width to the plant body.shoot tip
root tip
vascular cambium
phloem

Answers


vascular cambium


Apical Meristems are found in the tips of the roots and in the buds of the shoots. They supply cells for the plants to grow in length.

Apical Meristems are found in herbaceous plants, woody plants, grasses, and flowering plants.

In flowering plants, shoot apical meristem develops into an inflorescence meristem which produces the floral meristem. The floral meristem is responsible for the production of the sepals, petals, stamens, and carpels of the flower.

The correct answer is C.

Tissues arranged together make up _____, which, when functioning together in groups, make up _____.

Answers

Tissues arranged together make up organs, which, when functioning together in groups, make up organ systems.

Final answer:

Tissues when arranged together form organs, and these organs functioning together in groups make up organ systems. Each organ system has a specific function in the body.

Explanation:

In the field of Biology, tissues arranged together make up what is known as organs. These organs, when they function together in groups, create various organ systems. For instance, the heart and blood vessels make up the circulatory system. Each organ within the system has a specific function, but they all work together to allow the system to fulfill a larger role within the body.

Learn more about Human Anatomy here:

brainly.com/question/32270042

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Red blood cellsPlateletsWhite blood cells carry oxygen to cells and take carbon dioxide away.

Answers

The answer is red blood cells. Platelet clogs injury to prevent blood lost and white blood cell destroys invading intruder

Which of the following senses is most closely related to balance? A. Taste
B. Touch
C. Smell
D. Hearing

Answers

The sense which is most closely related to balance among these would most likely be hearing - d. With the help of hearing we are able to distinguish how far away we are from a certian location to another location just based on the sound that our feet are making which is essential in keeping and maintaining balance. 
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