Respiratory & Circulatory Systems: Structure, Function & Conditions
The Respiratory System
Structure and Function
The respiratory system facilitates gas exchange between our body and the atmosphere. It involves various organs, each with a specific role:
- Nostrils: These openings in the nose allow air to enter and exit the respiratory system. They are lined with a mucous membrane and cilia, which help filter and humidify the air.
- Epiglottis: This flap of cartilage prevents food from entering the trachea during swallowing.
- Larynx: Also known as the voice box, the larynx
Understanding Dysmorphology and Genetic Disorders
Understanding Dysmorphology
Definition and Classification of Congenital Anomalies
Dysmorphology is the study of human congenital malformations (birth defects). Congenital anomalies are classified as follows:
1. Malformation
A morphological defect of an organ or part of an organ resulting from an abnormal developmental process. Examples include cleft lip, spina bifida, and polydactyly.
2. Disruption
A morphological defect resulting from the breakdown of or interference with a normal developmental process.
Read MoreUnderstanding Biological Molecules: Amino Acids, Proteins, and Genetic Code
B1OA: Amino Acids and Proteins
1. Amino Acid Structure
Amino acids are organic molecules containing an amino group (-NH2) and a carboxyl group (-COOH). These functional groups give amino acids their characteristic properties.
2. Protein Structure and Stability
Proteins fold into specific three-dimensional structures, stabilized by various interactions, including:
- Ionic bonds
- Hydrogen bonding
- Van der Waals forces
- Disulfide bonds
- Hydrophobic interactions
The stability of a protein’s structure is crucial for
Read MoreIntroduction to Biology: Macromolecules, Cells, and Genetics
Macromolecules
Carbohydrates
Carbohydrates are composed of monosaccharides and provide energy. Examples include glucose, fructose, and cellulose.
Lipids
Lipids are nonpolar molecules, such as triglycerides and phospholipids, that store energy and form cell membranes.
Proteins
Proteins are made of amino acids and have diverse functions, including enzymatic activity, transport, and support.
Nucleic Acids
Nucleic acids, like DNA and RNA, store and transmit genetic information.
Cells
Cell Structure
Cells are the
Read MoreBiology Q&A: Genetics, Ecology, and More
What is DNA recombinant technology?
Recombinant DNA technology involves joining DNA molecules from two different species and inserting them into a host organism to produce new genetic combinations valuable to science, medicine, agriculture, and industry.
Steps Involved in Recombinant DNA Technology:
- Identification and isolation of the gene of interest
- Joining the gene into a suitable vector
- Introduction of the vector into a suitable organism
- Multiplication or expression of the gene of interest
Differences
Read MoreRegulation of Potassium and Body Water: A Comprehensive Guide
Regulation of Potassium
The body maintains potassium balance through internal and external mechanisms.
Internal Balance
- Insulin: Promotes potassium uptake into cells.
- Acidosis: Leads to hyperkalemia (high potassium levels).
- Adrenaline and Noradrenaline: Influence potassium distribution between cells and extracellular fluid.
- Cell lysis, exercise, and increased extracellular osmolarity: Cause potassium to move out of cells.
External Balance
Factors affecting potassium excretion include:
- Extracellular potassium