48 hour chick embryo serial cross section

Promotes reabsorption of water in kidneys and therefore facilitates production of concentrated urine -released from pituatary gland in the brain -stimuli: detection of high blood osmolarity by receptors in hypothalamus and detection of low blood pressure by receptors in heart -> Home-tek Penguin Steam Cleaner Manual. Cortical reaction which results in slow block to polyspermy -cortical granules fuse with the plasma membrane and release their contents (enzymes and polysaccharides) into the space between the plasma and vitelline membranes, causing the plasma and vitelline membranes to separate from one another -water follows osmolarity gradient created by saccharides released into intermembrane space, and the vitelline membrane then swells and moves away from plasma membrane. In gastrulation some cells forming hollow blastula invaginate to form opening called blastopore, now embryo termed a gastrula.įollowing acrosomal reaction of sperm which is induced by extracellular jelly surrounding the egg, the plasma membrane at the tip of the acrosomal process binds to plasma membrane surrounding the egg -causes depolarization of egg's plasma membrane, responsible for fast block to polyspermy 2. Gastrulation - cleavage ends when group of cells begin to differentiate in a process called gastrulation. With further divisions, hollow cavity termed blastocoel forms within the morula, which is now termed a blastula.

Cleavage - zygote - a single cell - repeatedly divides to create a ball of smaller and smaller cells ->initially solid ball termed a morula. Fertilization - haploid male and female gametes fuse ->result in a diploid zygote (fertilized egg) 2.

48 hour chick embryo serial cross section