Answer:
C) Release of von Willebrand factor (vWF) from the endothelium, not the epithelium.
Explanation:
Hemostasis is the physiological process of reparation and maintenance of a blood vessel to stop excess loss of blood in case of vascular injury. This process occurs in four stages:
- Vascular Injury i.e. a breach in the endothelial barrier. This results in the dislodge of endothelial cells, exposing the collagen fibers underneath.
- Vascular constriction or vasoconstriction is the constriction of the blood vessels to prevent excessive blood loss.
- Platelet plug formation involves the aggregation and adhesion of platelets to the endothelium.
- Coagulation
Platelet plug formation occurs by the adhesion of circulating platelets to the collagen fibers that have been exposed by dislodging of the endothelial cells. The endothelium, as well as the platelets release a ligand known as the von Willebrand factor (vWF). This molecule acts as a relay or bridge between the integrin receptors on the platelets and the exposed collagen fibers.
Platelets also release chemicals to attract more platelets to the wound site, resulting in more vWF release. This results in more and more platelets adhering to the endothelium, leading to platelet plug formation.
Hello. You forgot to put the image that complements this question.
The image is attached below:
Answer:
A = 38.465.
Explanation:
To arrive at the result you will have to perform a very simple calculation, using the fromula shown in the question above.
First, it will be necessary to find the diameter of the figure, to
therefore, you will have to divide, which will result in 3.5.
You can now replace the values in the formula: A = (3.14) (3.5) ² = (3.14) (12.25)= 38.465.
The endosymbiotic theory stated
that the mitochondria of eukaryotic cells are actually prokaryotic bacteria
which were once engulfed by prehistoric eukaryotic cells as a result of
evolution.
Therefore to answer this
question, here are some characteristics:
1 Both mitochondria and prokaryotic cells contain their own
DNA.
2 Neither of the two have
true nuclei, but they do have a space in which their DNA is enclosed.
3 Mitochondria and prokaryotic cells have similar
transcriptional machinery, which means that they have the same process of
making RNA from DNA.
<span>4 Mitochondria
contain their own genome, and the formation of their genome in most organisms
is circular similar to prokaryotes.</span>
1. Protein Coat 2. Nucleic Acid
rose thorns are multicellular
i hope this helps! :)
