Precapillary sphincters will a. cause blood to flow directly from the metarteriole into the postcapillary venule. b. control blo
od flow into the true capillaries. c. close when the tissue's needs have been met. d. open when the tissue needs nutrients. e. All of the answers are correct.
Meta arteriole is a type of vessel present in the micro-circulatory pathway of the human body, which possesses characteristics of both the arteriole and the capillaries.
The structure of metarteriole usually connects the arteriole to the venules and they possess smooth muscle rings at the entrance of the vessel in the capillary and thus acts as a sphincter. This sphincter controls the flow of blood into the venules and capillaries.
The precapillary sphincters are usually closed but when the tissue needs the oxygen the sphincter opens and supplies the blood.
Humans ferment lactic acid in muscles where oxygen becomes depleted, which is why sometimes if you finish a run and don't stretch soon you have have discomfort. <span />
It is called ecological succession, which can take up to a decade. It is a process of change in the species structure that occurs after a vast loss or extinction. Ecologists study how complexity is evident when a community is formed or occurrence takes place from an empty land or bare soil.