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liberstina [14]
4 years ago
15

When platelets attach to collagen threads in an injured vessel the platelets swell, form extensions and then stick together. as

a result of these steps what structure is formed?
Biology
1 answer:
Brrunno [24]4 years ago
5 0
Answer is: platelet plug
 
When platelets stick to each other and to the blood vessel they form a plug in the hole of the vessel. This process is called platelet aggregation.

Before the plug forms,  a platelet will stick to the blood vessel (adhesion), change its shape and signal other platelets to come help (activation and secretion). Then they stick to each other (aggregation).




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Describe primates. What specific physical features they have?
Musya8 [376]

Answer:

A primate is any member of the biological order Primates, the group that contains all the species commonly related to the lemurs, monkeys, and apes, with the latter category including humans. Primates are found all over the world. Non-human primates occur mostly in Central and South America, Africa, and southern Asia

Explanation:

A primate is any member of the biological order Primates, the group that contains all the species commonly related to the lemurs, monkeys, and apes, with the latter category including humans. Primates are found all over the world. Non-human primates occur mostly in Central and South America, Africa, and southern Asia

7 0
3 years ago
A population of Muscovy ducks contains 13 birds with black masks and 37 birds with red masks. Red masks are the dominant trait.
Semmy [17]

Answer: Black allele has frequency of 0.14.

              Red allele has frequency of 0.86.

             The frequency of heterozygotes is 0.241

Explanation: <em>Hardy-Weinberg model </em>states the frequency of alleles in a population will stay in equilibrium as long as there are external influences. It is also used to determine alleles frequencies using the following equations:

p+q=1

p^{2}+2pq+q^{2}=1

p represents frequency of dominant allele;

q represents frequency of recessive allele;

2pq is frequency of heterozygotes;

For the frequency of red allele, which is dominant, we can use:

p^{2}=\frac{37}{13+37}

p^{2}=\frac{37}{50}

p^{2}=0.74

p=\sqrt{0.74}

p = 0.86

For the black allele:

p+q=1

q=1-p

q=1-0.86

q = 0.14

Frequency of heterozygotes is

2pq = 2(0.86)(0.14)

2pq = 0.241

<u>Frequencies for a population of Muscovy ducks are </u><u>0.86 for red allele, 0.14 for black allele and 0.241 for heterozygote.</u>

5 0
3 years ago
Earth has five layers based on physical characteristics. The diagram below shows these
sdas [7]
I think it’s D but if it’s wrong I don’t know because I just did this.
5 0
3 years ago
Plants draw water out of the ground and release water vapor into the atmosphere.
Sunny_sXe [5.5K]
The answer is transpiration
6 0
4 years ago
Read 2 more answers
Explain how an organism uses energy to maintain homeostasis <br><br> Need help! answer ASAP
Andrej [43]

Answer: Active transport

Explanation: <u>Active transport is one way in which organisms maintain homeostasis.</u> For example, an amoeba uses phagocytosis to<u> take in food</u>. The amoeba needs the food for <u>energy and growth</u>.

5 0
4 years ago
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