The area that will undergo examination is known as the EPIGASTRIC REGION. The epigastric region is identified as the upper central part of the abdomen, specifically located between the costal margin and the sub-coastal plane.
Euglena presenta un color verde gracias al clorofila que se encuentra en los cloroplastos de este organismo, y la estructura corporal situada en su base se llama flagelo.
Explanation:
Las Euglenas son especies que habitan en aguas dulces y saladas, y se encuentran en gran cantidad en cuerpos de agua interiores, donde pueden proliferar y teñir la superficie del agua de zanjas y estanques de un color verde.
Este color verde que producen se debe en gran parte a la clorofila que se halla en sus cloroplastos, la cual es el pigmento responsable del color verde. Este pigmento también es el causante de la coloración en este caso.
Las Euglenas cuentan con una estructura corporal especializada, ubicada en la base de su cola, que les permite moverse.
Esta estructura especializada se denomina flagelo.
The retina forms the inner layer of the eye, characterized by a complex network of various types of cells arranged in multiple layers. The primary mechanism for processing in the retina is the lateral interactions between these cells, with lateral inhibition being the most prominent type. Photoreceptors are the cells that capture light and convert it into an electrical signal, comprising cones and rods. Horizontal cells facilitate the lateral spatial interactions between these photoreceptors. Bipolar cells gather information from both the photoreceptors and horizontal cells and convey it to the inner layers of the retina. The retina consists of five stratified layers, including the external plexiform layer, where the lateral inhibition first occurs through horizontal cells that connect with photoreceptors and bipolar cells. This connection allows for modulation of the response of photoreceptors, enabling enhanced contrast and clarity in perceived images, largely due to inhibitory neurotransmitters like GABA. The extent of lateral inhibition is adaptable to light levels, and the gap junctions between horizontal cells and photoreceptors adjust according to light conditions.
