Understanding Human Multicellularity: Cell Functions & Reproduction
Humans as Multicellular Organisms
The three primary functions of an organism are interaction, nutrition, and reproduction.
Nutrition: This is the process by which cells and organisms obtain energy from food.
Interaction: This refers to an organism’s ability to detect and react to external or internal stimuli.
Reproduction: This is the biological process by which new individual organisms are produced from their parents.
The Cell
The cell is the functional unit of all organisms, the smallest living part
Read MoreAyurvedic Concept of Ojas: Immunity, Life Force & Vitality
आयुर्वेद के अनुसार ओजस: प्रतिरक्षा और जीवन शक्ति ss15/15
संदर्भ: [आयुर्वेद] रस-रक्त आदि सप्त धातु ss15/15
मन और शरीर का गहरा संबंध होता है। ss15/15
ओजस शारीरिक और मानसिक स्वास्थ्य का एक महत्वपूर्ण पहलू है। ss15/19
आयुर्वेदिक
Read MoreRhesus Blood Groups and Maternal-Fetal RhD Incompatibility
Rhesus Blood Groups and RhD Incompatibility
Rhesus Blood Group System
- Genetically determined by 6 important antigens (among approximately 50 antigens): c-C, d-D, e-E.
- Presence of antigen D (a strong antigen) on the erythrocyte membrane determines positivity (Rh+). This applies to about 85% of the European population.
- Possible Genotypes: CDE, CDe, cDe, cDE
- Rh negativity (Rh-) is determined by the d antigen (a weak antigen).
- Possible Genotypes: Cde, Cde, cde, cdE
- Sometimes, the presence of the E antigen
Nervous System Function: Autonomic Control & Neural Signals
Nervous System Organization
The Nervous System comprises two main parts:
- Central Nervous System (CNS): Consists of the brain and spinal cord. It builds and maintains models of the environment, makes decisions, and processes sensory information. Grey matter contains dendrites and cell bodies, while white matter consists of myelinated axons. The blood-brain barrier tightly regulates substances entering the brain.
- Peripheral Nervous System (PNS): Includes all neural tissue outside the CNS, connecting
Fundamentals of Biology: Energy, Atoms, Molecules, and Systems
Energy and Its Forms
Energy is the ability to cause changes. There are two kinds:
- Potential Energy: Unactualized energy.
- Kinetic Energy: Active energy. Examples include heat, electricity, light, and movement. Potential energy includes gravity and chemical energy.
Atoms and Molecules
Atoms are the smallest unit of an element (e.g., Oxygen, Hydrogen, Nitrogen, Carbon, Iron).
Subatomic Particles and Molecules
Subatomic Particles (protons, neutrons, and electrons) together make up atoms, which form molecules.
Read MoreKey Biological Processes and Concepts Explained
Key Biological Processes
Transcription, Translation, and Translocation
Transcription: The process of RNA synthesis.
Translation: Amino acids are supplied by tRNA according to the message on mRNA. tRNA has an ‘anticodon’ with a complementary sequence to the codon on mRNA.
Translocation: The ribosome moves along the mRNA by the distance of one triplet codon.
Central Dogma: The process of protein synthesis from DNA through RNA.
Important Biological Molecules
NAD: Nicotinamide Adenine Dinucleotide
FAD: Flavin
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