Zoology

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Thyroid Gland – Structure, Hormones, Functions, Disorders

31 min readby
Thyroid Gland Anatomy and Histology

What is Thyroid Gland? Definition of Thyroid Gland The thyroid gland is a butterfly-shaped endocrine organ located in the anterior neck that produces hormones such as thyroxine (T4), triiodothyronine (T3), and calcitonin, which regulate metabolism, growth, and calcium homeostasis. It plays a crucial role in maintaining the body’s metabolic rate and overall hormonal balance. Anatomical … Read more

Study of larval forms In Protochordates

18 min readby
Study of larval forms In Protochordates

Larval Forms in Protochordates The larval forms of Protochordates, along with the subphylum Cephalochordata (lancelets) and Urochordata (tunicates), are central to the clarification of the phylogeny of Chordata. The larval stages of Protochordates exhibit very typical characteristics provided within all chordates, such as the presence of a notochord. The larval forms of Protochordates are essential … Read more

Migration in Fishes – Causes, Types, Methods, Significance

29 min readby
Migration in Fishes - Causes, Types, Methods, Significance

What is Fish migration? Fish migration is the active, regular movement of fish populations from one place to another, often over long distances and various environments. This behavior is critical to the survival of fish and is a function of varied ecological, environmental, and biological factors. Fish migration is specific to different fish species, ranging … Read more

Evolution – Definition, Types, Advantages, Examples

23 min readby
Evolution - Definition, Types, Advantages, Examples

What is Evolution? Definition of Evolution Evolution is the process by which species change over time through the gradual accumulation of genetic variations, driven by mechanisms like natural selection, genetic drift, and mutation, leading to the development of new traits or species. Evolution Theory The theory of evolution explains how species change over time through … Read more

Menstrual Cycle – Definition, Stages, Significance

4 revisions 15 min readby
Ovarian Hormones Throughout the Menstrual Cycle

What is Menstrual Cycle? Definition of Menstrual Cycle The menstrual cycle is a monthly series of physiological changes in the female reproductive system, characterized by the maturation and release of an ovum from the ovaries and the preparation of the uterine lining for potential implantation of a fertilized egg. If fertilization does not occur, the … Read more

Sperm Cell – Definition, Structure, Functions

4 revisions 11 min readby
Structure of Sperm Cell

What is Sperm Cell? Definition of Sperm Cell A sperm cell, or spermatozoon, is the male reproductive cell in sexual reproduction, produced in the testes through the process of spermatogenesis. It is a haploid cell containing half the number of chromosomes and is designed to fertilize a female egg cell, leading to the formation of … Read more

Skin – Definition, Structure, Disorders, Functions

23 min readby
Anatomy of the Skin

What is Skin? Definition of Skin Skin is the body’s largest organ, serving as a protective outer layer that covers and shields internal organs, muscles, and bones. It regulates body temperature, enables sensory perception, synthesizes vitamins, and acts as a barrier against pathogens and environmental damage. Gross Structure of Skin The skin’s composition varies across … Read more

Double Circulation – Types, Process, Advantages

10 min readby
Double Circulation

What is Double Circulation? Types of Circulatory Systems In the animal kingdom, circulatory systems are fundamental for the transport of nutrients, gases, and waste products. There are primarily two types of circulatory systems: the open circulatory system and the closed circulatory system. Each of these systems has distinct mechanisms and efficiency levels, catering to the … Read more

Human Teeth – Structure, Types, Functions

11 min readby
Structure of Human Teeth

Human teeth play a crucial role in the process of digestion, enabling the breakdown of food into smaller, manageable pieces before swallowing. Unlike some animals that can consume food in one large gulp, humans rely on their teeth to perform various functions essential for effective mastication. This article provides an overview of the structure, types, … Read more

Artificial Selection – Theory, Types, Advantages, Examples

20 min readby
Artificial Selection of Plant Traits

What is Artificial Selection? Definition of Artificial Selection Artificial selection, or selective breeding, is the human-driven process of breeding plants or animals to promote desirable traits in offspring by selecting specific individuals with those traits to reproduce. Darwin’s Experiments With Artificial Selection Darwin’s experiments with artificial selection were pivotal in the development of his theories … Read more

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