Answer:
Hernando de Soto discovered the Mississippi River.
Explanation:
- In 1539 Hernando de Soto and five hundred adventurers began on a journey of exploration that would take 4 years and would travel through 10 states in the southeast United States. His goal was to discover a source of wealth, preferably gold, and around his mines establish a settlement.
- Hernando de Soto and his expedition became the first Europeans to see and cross the mighty Mississippi River.
Answer:
Hey there!
The correct answer would be Synovial. A synovial joint allows the arm to bend.
The Lake and Ponds Biome.
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.