What type of stress reaction results from experiencing an extremely difficult incident and has signs that occur immediately or shortly after the incident?

Acute stress reaction results from experiencing an extremely difficult incident and has signs that occur immediately or shortly after the incident.

Acute stress reaction results from exposure to high-stress conditions. The signs and symptoms appear immediately or shortly after the incidence has happened and involves changes or reactions in physical, cognitive, behavioral and psychological functions.

The common symptoms that appear are anxiety, irritability, loss of appetite, depression, exhaustion, lack of energy etc.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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