An ischemic stroke involves within the brain. an infection of glial cells vasodilation obstruction of blood flow shearing of blood vessels bleeding

An ischemic stroke is the sudden loss of blood flow to an area of the brain. It results in loss of neurological function.

Ischemic stroke involves the obstruction of blood flow within the brain. The obstruction can be caused by a thrombotic or embolic occlusion of an artery in the brain.  

Producers (autotrophs) are in the bottom (first) trophic level, primary consumers are in the second trophic level, secondary consumers are in the third trophic level and tertiary consumers are in the top trophic level. energy moves through the trophic levels when one living organism is being consumed by another. moreover, energy level becomes lower as it moves up the energy pyramid because of it being released as heat. food chain is when there is a single pathway of energy transfer whereas a food web is when there are multiple pathways of energy transfer.