Evidence and Mechanisms of Evolution
Homologous Organs
The presence of organs with the same structural patterns but different functions in species that live in different environments is strong evidence of a common ancestor. These organs, called homologous organs, are the result of divergent evolution or adaptive radiation. Groups of individuals coming from the same species but living in different environments develop different functions or adaptations as a result of different selective pressures.
Vestigial Organs
Vestigial organs are
Read MoreHuman Physiology: A Comprehensive Guide to the Body’s Functions
Renin-Angiotensin-Aldosterone System (RAAS)
The renin-angiotensin-aldosterone system (RAAS) is a system of hormones, proteins, enzymes, and reactions that regulate your blood pressure and blood volume on a long-term basis.
It regulates your blood pressure by increasing sodium (salt) reabsorption, water reabsorption (retention), and vascular tone (the degree to which your blood vessels constrict, or narrow). The RAAS consists of three major substances, including:
- Renin (an enzyme)
- Angiotensin II (a hormone)
Human Anatomy and Physiology: A Comprehensive Guide to the Body’s Systems
Renin-angiotensin-aldosterone system (RAAS)
ECG (electrocardiogram)
Dental formula- I – 2/2 C – 1/1 P – 2/2 M – 3/3 = 16 x 2 = 32
The main components of the nephron are the glomerulus, the Bowman’s capsule or glomerular capsule, the proximal convoluted tubule, the loop of Henle, and the distal convoluted tubule.
Tidal volume is the amount of air that moves in or out of the lungs with each respiratory cycle.
Larynx is also known as voice box.
Lymph (clear, watery fluid) and lymphocytes (white blood cells)
Read MoreElectron Transport Chain and Urea Cycle: Processes and Disorders
Electron Transport Chain (ETC)
The electron transport chain (ETC) is a crucial process for cellular respiration and energy production. Let’s explore its details:
Location and Components:
The ETC resides in the inner mitochondrial membrane of eukaryotic cells, specifically within the cristae. In prokaryotes, it’s embedded in the plasma membrane. The chain comprises protein complexes (I-IV), coenzyme Q10 (CoQ10/ubiquinone), and cytochrome c, all acting as electron carriers.
Function and Complexes:
The
Read MoreClassification of Organisms: A Comprehensive Guide
Proposed by Linnaeus
➢ Kingdom Plantae and kingdom Animalia
➢ DEMERITS :-
1. Did not distinguish between the eukaryotes
and prokaryotes.
2. Did not distinguish between unicellular and
multicellular organisms
3. Did not distinguish between photosynthetic
and non-photosynthetic organisms.
➢ Proposed by R.H.
Whittaker (1969)
➢ It includes Monera, Protista, Fungi, Plantae and
Animalia
➢ Criteria for classification are,
1. Cell structure,
2. Body organization
3. Mode of nutrition
4. Reproduction
5. Phylogenetic
Read MoreHuman Biology: Cells, Functions, and Exchange of Substances
Chemical Composition and Life Functions
- Chemical Composition: Organic and inorganic biomolecules
- Cellular Structure: Trillions of eukaryotic cells, multicellular
- Life Functions: Reproduction, interaction, nutrition
Types of Cells
- Neuron: Transmits information (nervous system)
- Osteocyte: Creates and produces bone (bone)
- Keratinocyte: Produces hair, nails, scales, and horns (skin)
- Cardiomyocyte: Contracts and relaxes to pump blood (heart)
Levels of Organization
- Cell: Smallest component of a living thing
- Tissue: