Cellular Structures: Endoplasmic Reticulum, Golgi, Lysosomes, and More
Cellular Structures
Endoplasmic Reticulum
The endoplasmic reticulum (ER) is a network of membranes extending throughout the cytoplasm from the nuclear envelope to the cell periphery. It consists of flattened sacs (cisternae) and interconnected tubules.
Types of ER
- Smooth ER: A network of smooth tubules without ribosomes. Functions include lipid synthesis, detoxification of toxic substances, and regulation of intracellular calcium levels.
- Rough ER: Composed of flattened sacs with ribosomes attached to
Water Dynamics: Hydrological Cycle, Basins, and Erosion
Water’s Role in Shaping Landscapes
Water, a dominant agent of landscape alteration, erodes terrain and transports sediments. The total water in the hydrosphere is approximately 1,360 million cubic kilometers. This water is constantly moving, interacting with the hydrosphere, atmosphere, solid earth, and biosphere. This continuous movement is known as the hydrological cycle.
Hydrographic Basins
A hydrographic basin is an area of land drained by a single natural drainage system. It is defined by the
Read MoreLabor Unions, Strikes, and Workplace Risks: Regulations
Labor Unions, Federations, and Confederations
Article 356 .- Workers’ unions or employers’ associations are formed for the study, defense, and improvement of their respective interests.
Article 357 .- Workers and employers have the right to form unions without prior authorization.
Article 358 .- No one can be forced to join or not to join a union. Any stipulation that establishes a penalty for joining or not joining a union, or that undermines the previous arrangement, will be considered null and void.
Read MoreVirus: Structure, Characteristics, and Replication Mechanisms
Microorganisms: Viruses
Microorganisms without cellular organization: Viruses are entities with a simple structure, often described as subcellular. They are not considered living organisms and do not perform metabolic functions on their own. Instead, they rely on the metabolic machinery of a host cell to reproduce. This makes them obligate intracellular parasites, infecting bacteria (bacteriophages or phages), plant cells, and animal cells.
Virus particles, also called virions, consist of a molecule
Read MoreUnderstanding Climate, Population Growth, and European Union Dynamics
Terms and Concepts Related to Climate and Population
Temperature: The air temperature is affected by sunlight. It is usually measured in degrees Celsius. This data is provided daily or annually.
This pressure at: The pressure exerted by air on the Earth’s surface. The average pressure at sea level is 1.013 millibars. High pressure is considered normal, while low pressure is considered unusual.
Isotropic: Imaginary lines that serve to represent temperatures on maps.
Latitude and Altitude: These coordinates
Thomas Aquinas: Philosophy and Theology
Thomas Aquinas
Born into a noble family in Roccasecca, Italy (1224-1225), Thomas Aquinas studied at the Benedictine monastery of Montecassino and the University of Naples. He joined the Dominican Order in 1243, the year of his father’s death, despite not yet being a graduate. His mother, opposed to Thomas’ entry into a mendicant order, confined him to the family castle for over a year in a vain attempt to make him abandon the path he had chosen. He was released in 1245, and then traveled to Paris
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