Air Pollution: Health Effects, Smog, and Biomonitoring
Hazard Effects of Common Chemical Pollutants in the Open Air
Photooxidative and Reductive Smog, Formation, and Health Risks; Biomonitoring of Atmospheric Pollution
Background:
Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere.
A substance in the air that can cause harm to humans and the environment is known as
The Integumentary and Skeletal Systems: A Comprehensive Guide
Integumentary System
The integumentary system protects the body’s internal living tissues and organs, protects against invasion by infectious organisms, protects the body from dehydration, protects the body against abrupt changes in temperature, helps dispose of waste materials, acts as a receptor for touch, pressure, pain, heat, and cold, and stores water and fat.
Chronic Paronychia
Chronic Paronychia Chronic paronychia is a gradual process and much more difficult to get rid of. It may start in one
Read MoreIntroduction to the Biosphere and Ecosystems
The Biosphere
The biosphere encompasses all living organisms on Earth, forming a dynamic system that interacts with the atmosphere, hydrosphere, and Earth’s surface. Living things are open systems, utilizing energy and matter from their environment and returning degraded matter and energy, primarily as heat and work.
Biomass
Biomass represents the total mass of living organisms within a specific area at a given time. Due to its variability, biomass is often measured in dry matter or carbon mass. To
Read MoreGenetics Glossary: From DNA to Phenotype
DNA
One of the two nucleic acids found in cells. The sequence of nitrogenous bases in the DNA molecule contains the genetic instructions used to build living organisms. In eukaryotic cells, DNA is found in the cell nucleus, supercoiled around proteins called histones to form chromosomes. DNA is the material that contains the genetic information of living things. Scientists once believed that proteins were the carriers of this information.
DNA Polymerase
An enzyme that catalyzes the replication of DNA.
Read MoreHormonal Regulation: Aldosterone, Insulin, Calcium, Estrogen & Progesterone
Aldosterone
Roles:
The main functions of aldosterone are its circulatory and renal effects. It stimulates sodium reabsorption and potassium secretion in the latter portion of the distal tubule and collecting duct. This leads to water reabsorption, provided ADH is present to activate aquaporin II channels, increasing extracellular fluid and blood pressure.
Hyperaldosteronism: The main problem is excessive potassium loss, which is crucial for muscle activity.
Hypoaldosteronism: This leads to hyperkalemia,
Read MoreCell Biology: Structure and Function of Cell Membrane and Transport
Functions of Nucleotides
Nucleotides play crucial roles in various cellular processes:
- Form the building blocks of nucleic acids (DNA and RNA).
- Provide energy (ATP is the primary energy currency for animals and plants).
- Act as coenzymes in metabolic reactions.
- Serve as cellular messengers (e.g., cyclic AMP in hormone signaling).
Composition and Molecular Features of Nucleotides
Nucleotides consist of three main components:
- A nitrogenous base (purines or pyrimidines)
- A pentose sugar (ribose or deoxyribose)