Think of a stroke as a "brain attack"— it is an emergency! When symptoms appear call 911 immediately; every minute counts. A stroke occurs when the brain is deprived of blood supply. Without oxygen brain cells die. Depending on the area affected, a person may have problems speaking, walking, seeing, or thinking. It may result in permanent brain damage, disability or death. If the stroke is caused by a blood clot, a clot-busting drug may be given to restore blood supply.To understand stroke, it is helpful to understand the circulatory system of the brain (see Anatomy of the Brain). Blood is carried to the brain by two paired arteries, the internal carotid arteries and the vertebral arteries (Fig. 1). The internal carotid arteries supply the anterior (front) areas and the vertebral arteries supply the posterior (back) areas of the brain. After passing through the skull, the right and left vertebral arteries join together to form a single basilar artery.
The basilar artery and the internal carotid arteries “communicate” with each other in a ring at the base of the brain called the Circle of Willis by the anterior communicating (Acom) and posterior communicating (Pcom) arteries. The middle cerebral artery is the artery most often occluded in stroke.
Answer:
Warm air rises on land and moves toward the ocean to cool
Cool air moves from the ocean to be warmed by the land
Explanation:
The land heats up faster than the oceans during the day. This is because water has a high heat capacity and takes more energy to raise its temperatures by one degree (even in comparison to land). Therefore land heats up the air above it faster than the oceans. The air mass over land rises due to drop in density. The cooler and denser air mass above the oceans moves towards land to replace the rising warm air. This creates a cool breeze felt on land during the day as the cool air rushes in.
Answer:
Supporters of genetic engineering in agriculture point to a multitude of potential benefits of engineered crops, including increased yield, drought tolerance, reduced pesticide use, more efficient use of fertilizers, and ability to produce drugs or other useful chemicals.
<span>The answer is a sexual reproduction. This is due to the formation
of gametes that enable the variation of the offspring of the parents. Firstly,
each gamete contributes half the genetic material (alleles)from either parent.
The dominant alleles will show in the phenotype of the c=ofspirng. Additionally,
during meiosis (the process that makes gametes), recombination of genetic
material can occur hence transferring unique combination of genes from that of
the parent. Therefore, there are many possible combinations of gametes that
gives the offspring variance from the parents</span>
