Animal Cells: Structure and Function
Key Biological Processes
- Nutrition: The process by which living matter absorbs and incorporates energy from the internal and external environment that surrounds it.
- Value: The process by which living beings receive information from the internal and external environment around them and adjust their operation to survive in that environment.
- Reproduction: The process by which living things give rise to other bodies that are similar or equal to them.
Eukaryotic Cell
Eukaryotic cells have their fundamental
Read MoreGametogenesis, Pollination, and Cellular Division: A Comprehensive Look
Gametogenesis
Gametogenesis occurs in gametes, encompassing spermatogenesis and oogenesis. Spermatogenesis involves the transformation of spermatogonia into spermatocytes of the 1st order. Through the 1st meiotic division, these become 2 spermatocytes of the 2nd order, which then yield 4 spermatids (n). Oogenesis begins in the embryonic stage. Oocytes of the 1st order are surrounded by follicular cells, forming primordial follicles. This process pauses until puberty. Each 1st order oocyte forms a
Read MoreOrigin of Life and Evolution Theories
Life’s Origin
Miller’s Experiment (The Primordial Soup Theory).
In 1953, Stanley Miller, and his professor, Harold Urey, performed an experiment that demonstrated how organic molecules could have spontaneously formed on early Earth from inorganic precursors. The now-famous “Miller-Urey experiment” used a highly reduced mixture of gases – methane, ammonia and hydrogen – to form basic organic monomers, such as amino acids.
Joan Oró
However, the current scientific consensus is that such was not
Read MoreCellular Transport: Passive and Active Mechanisms
Transport Across Membranes
- Plasma membranes separate the inner cellular environment (cytoplasm) from the extracellular environment (interstices- interstitial or extracellular space).
- Plasma membranes act as barriers to most, but not all, molecules.
- Plasma membranes are differentially permeable (semi-permeable).
- Materials move into and out of cells through passive transport or active transport.
1. Passive Transport
- Requires no energy from the cell.
- Requires a concentration gradient: unequal concentrations
Ojas: Essence of Vitality in Ayurveda
Definition (परिभाषा):
Ojas is the ultimate essence/radiance of all seven Dhatus (tissues), from Rasa to Shukra, pervading all Dhatus. For example, like ghee is present in milk.
Explanation:
Just as all seven Dhatus originate and are nourished by Aahar Rasa (nutritional fluid), Ojas also originates and is nourished by Aahar Rasa.
Origin:
The formation of Ojas is described in two stages:
- Intrauterine life (before birth).
- Extrauterine life (after birth).
Intrauterine Life Origin:
In the fetus,
Read MoreLivestock Growth, Development, and Environmental Factors
Growth and Interaction with the Environment
- It increases in weight (mass increase) before it reaches maturity.
- It is produced by cell division (hyperplasia) and elongation of cells (hypertrophy) through the incorporation of material from the environment.
- Changes in shape and body composition.
Development
Is defined as the coordination of all the different processes that take place in the animal until it reaches maturity.
Livestock production is to be understood as the set of processes of both growth and
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