Color blindness is not a form of blindness at all, but a deficiency in the way you see color. With this vision problem, you have difficulty distinguishing certain colors, such as blue and yellow or red and green.Color blindness (or, more accurately, color vision deficiency) is an inherited condition that affects males more frequently than females.According to Prevent Blindness America, an estimated 8 percent of males and less than 1 percent of females have color vision problems.ed-green color deficiency is the most common form of color blindness. Much more rarely, a person may inherit a trait that reduces the ability to see blue and yellow hues.
5. Ascending aorta, right aortic arch, left aortic arch, connecting to the descending aorta. 6. A vascular ring involves the aorta, its branches and sometimes remnants of vascular structures forming a ring around trachea and esophagus. A vascular sling involves the pulmonary artery.
Woody angiosperms have also vessels. The mature tracheids form a column of superposed, cylindrical dead cells whose end walls have been perforated, resulting in a continuous tube called vessel (trachea) . Tracheids are found in all vascular plants and are the only conducting elements in gymnosperms and ferns.Tracheids have Pits on their end walls. Pits are not nearly as efficient for water translocation as Perforation Plates found in vessel elements.oody angiosperms have also vessels. The mature tracheids form a column of superposed, cylindrical dead cells whose end walls have been perforated, resulting in a continuous tube called vessel (trachea) . Tracheids are found in all vascular plants and are the only conducting elements in gymnosperms and ferns.