Topics
Reproduction in Lower and Higher Plants
- Reproduction in Plant
- Mode of Reproduction in Plant
- Asexual Reproduction in Plant
- Vegetative Reproduction
- Natural Vegetative Reproduction
- Artificial Vegetative Reproduction - Conventional Method
- Sexual Reproduction in Flowering Plants
- Pre-fertilization in Plant: Structure and Events
- Pre-fertilization in Plant: Stamen (Male Reproductive Unit)
- Pre-fertilization in Plant: Microsporangium
- Structure of Microspore Or Pollen Grain
- Pre-fertilization in Plant: Pistil (Female Reproductive Unit)
- Pre-fertilization in Plant: Megasporangium
- Pre-fertilization in Plant: Formation of Embryo Sac
- Pollination
- Self Pollination (Autogamy)
- Cross Pollination
- Cross Pollination
- Agents of Pollination
- Outbreeding Devices
- Pollen Pistil Interaction
- Double Fertilization and Triple Fusion in Plant
- Post Fertilisation in Plant: Structures and Events
- Development of Endosperm
- Post Fertilization in Plant: Development of Embryo (Embryogeny)
- Formation of Seed and Fruit
- Apomixis
- Parthenocarpy
- Polyembryony
Reproduction in Lower and Higher Animals
- Reproduction in Animal and Human
- Mode of Reproduction in Animal
- Asexual Reproduction in Animal
- Sexual Reproduction in Animals
- Human Reproductive System
- The Male Reproductive System
- The Female Reproductive System
- Menstrual Cycle (Ovarian Cycle)
- Gametogenesis
- Fertilization in Human
- Syngamy
- Embryonic Development in Human
- Implantation in Human
- Pregnancy in Humans
- Placenta (Growth) in Human
- Parturition (Birth) in Human
- Lactation in Human
- Reproductive Health
- Population Stabilisation and Birth Control
- Medical Termination of Pregnancy (MTP)
- Sexually Transmitted Diseases (STD)
- Infertility
Inheritance and Variation
- Heredity
- Inheritance
- Gregor Johann Mendel – Father of Genetics
- Genes and Genetic
- Mendelian Inheritance - Mendel’s Laws of Heredity
- Back Cross and Test Cross
- Deviations from Mendel’s Findings
- Chromosomal Theory of Inheritance
- Chromosomes - The Carriers of Heredity
- Linkage and Crossing Over
- Autosomal Inheritance
- Sex Linked Inheritance
- Sex Determination
- Genetic Disorders
Molecular Basis of Inheritance
Origin and Evolution of Life
- Origin and Evolution of Universe and Earth
- Theories of Origin of Life
- Chemical Evolution of Life (Self-assembly Theory of the Origin of Life)
- Evolution
- Darwin’s Theory of Natural Selection
- Mutation Theory
- Modern Synthetic Theory of Evolution
- Mechanism of Organic Evolution
- Hardy Weinberg’s Principle
- Adaptive Radiation
- Evidences for Biological Evolution
- Speciation
- Geological Time Scale
- Origin and Evolution of Man
Plant Water Relation
- Plant Water Relation
- Properties of Water
- Water and Mineral Absorption by Root
- Characteristics of Roots for Absorbing Water
- Water Available to Roots for Absorption
- Means of Transport in Plants
- Concept of Imbibition
- Simple Diffusion
- Concept of Osmosis
- Osmotic Pressure
- Facilitated Diffusion
- Turgidity and Flaccidity (Plasmolysis)
- Active Transport
- Passive Transport
- Water Potential (ψ)
- Path of Water Across the Root
- Translocation of Water (Ascent of Sap)
- Translocation of Mineral Ions
- Transport of Food
- Transpiration
- Kinds of Transpiration
- Structure of Stomatal Apparatus
- Significance of Transpiration
Plant Growth and Mineral Nutrition
- Plant Growth
- Phases of Plant Growth
- Conditions Necessary for Plant Growth
- Plant Growth Rate
- Types of Plant Growth
- Plant Growth Curve
- Differentiation, De-differentiation, Re- Differentiation
- Plant Development
- Plant Plasticity
- Plant Hormones
- Types of Plant Hormones: Auxins
- Types of Plant Hormones: Gibberellins
- Types of Plant Hormones: Cytokinins
- Types of Plant Hormones: Ethylene
- Types of Plant Hormones: Abscisic Acid (ABA)
- Photoperiodism
- Vernalization (Yarovization)
- Plant Mineral Nutrition
- Nitrogen Cycle
Respiration and Circulation
- Respiration
- Organs of Respiratory Exchange
- Human Respiratory System
- Breathing – Respiratory Cycle
- Regulation of Respiration
- Modified Respiratory Movements
- Disorders of Respiratory System
- Transportation in Living Organisms
- Circulation
- Types of Blood Circulation
- Types of Blood Circulation
- Blood Circulatory System in Human
- Composition of Blood: Plasma (The Liquid Portion of Blood)
- Composition of Blood: Red Blood Cells (Erythrocytes)
- Composition of Blood: White Blood Cells (Leukocytes)
- Composition of Blood: Blood Platelets (Thrombocytes)
- Function of Platelets - Clotting of Blood (Coagulation)
- Human Heart
- Circulation of Blood in the Heart: Cardiac Cycle
- Blood Vessels – Arteries, Veins, and Capillaries
- Blood Pressure (B.P.)
- Electrocardiogram (ECG)
- Lymph and Lymphatic System
Control and Co-ordination
- Control and Co-ordination
- Nervous System in Hydra
- Nervous System in Planaria (Flatworm)
- Neural Tissue
- Neuron (Or Nerve Cell) and Its Types
- Neuroglial Cells (Or Glial Cells)
- Neuron as Structural and Functional Unit of Neural System
- Nerve Fibres
- Synapse
- Transmission of Nerve Impulse
- Human Nervous System
- Central Nervous System (CNS)
- The Human Brain
- Central Nervous System (CNS): Structure of Human Brain
- The Spinal Cord
- Reflex and Reflex Action
- Reflex Arc
- Peripheral Nervous System (PNS)
- Sensory Receptors
- Human Eye: Structure of the Eye
- Working of the Human Eye
- Human Ear
- Disorders of Nervous System
- Hormones
- Human Endocrine System
- The Hypothalamus
- Pituitary Gland or Hypophysis Gland
- The Pineal Gland
- Thyroid Gland
- Parathyroid Gland
- Thymus Gland
- Adrenal Gland (Suprarenal Gland)
- Pancreas (Islets of Langerhans)
- Reproductive Glands (Gonads)
Human Health and Diseases
- Defence System in Our Body: Immune System
- Immunity
- Types of Immunity
- Vaccination and Immunization
- Structure of Antibody
- Disease
- Categories of Disease
- Protozoan Diseases
- Helminthic Diseases
- Bacterial Diseases
- Viral Diseases
- Fungal Diseases
- Vector Borne Diseases
- Cancer
- Sexually Transmitted Diseases (STD)
- Adolescence
- Addiction
- Drug Abuse
Enhancement of Food Production
- Improvement in Food Production
- Plant Breeding
- Tissue Culture
- Single Cell Protein (SCP)
- Biofortification
- Animal Husbandry (Livestock)
- Animal Breeding
- Dairy Farming
- Poultry Farming
- Apiculture (Bee Farming)
- Pisciculture (Fish Farming)
- Sericulture
- Lac Culture
- Microbes in Human Welfare
- Microbes in Industrial Production
- Microbes in Sewage Treatment
- Microbes in Energy Generation
- Microbes as Biocontrol Agents
- Microbes as Biofertilizers
Biotechnology
Organisms and Populations
Ecosystems and Energy Flow
Biodiversity, Conservation and Environmental Issues
- Biodiversity
- Levels of Biodiversity
- Patterns of Biodiversity
- Biodiversity Current Scenario
- Loss of Biodiversity
- Conservation of Wildlife
- Biological Diversity Act, 2002
- Environmental Issues
- Air Pollution and Its Causes
- Effects of Air Pollution
- Prevention of Air Pollution
- Noise Pollution
- Measures to Limit Noise Pollution
- Water Pollution and Its Causes
- Effects of Water Pollution
- Prevention of Water Pollution
- Green House Effect
- Preventive Measures of Green House Effect
- Global Warming
- Preventive Measures of Global Warming
- Ozone Layer Depletion
- Deforestation and Its Causes
- Mission Harit Maharashtra
Excretion and Osmoregulation
Human Reproduction
description
- The male reproductive system
- Testes
- Accessory ducts
- Accessory glands
- External genitalia
- Histology of seminiferous tubules
notes
The male reproductive system:
- The male reproductive system is located in the pelvis region.
Diagrammatic sectional view of a male pelvis showing reproductive system
- Male reproductive system includes:
- A pair of testes (primary sex-organ)
- Accessory ducts (rete testis, vas a efferentia epididymis, vas deferens)
- Accessory glands (paired seminal vescile, a prostate, and paired bulbourethral gland)
- External genitalia (Penis)
Diagrammatic view of male reproductive system
notes
A) Testes:
- The testes are situated outside the abdominal cavity within a pouch called scrotum.
- The scrotum helps in maintaining the low temperature of the testes (2-2.5oC lower than the normal internal body temperature) necessary for spermatogenesis.
- In adults, each testis is oval in shape, with a length of about 4 to 5 cm and a width of about 2 to 3 cm.
- The testis is covered by a dense covering.
- Each testis has about 250 compartments called testicular lobules.
Histology of Seminiferous tubules:
- Each lob contain one to three highly coiled seminiferous tubules in which sperms are produced.
- Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and Sertoli cells.
- The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.
- The regions outside the seminiferous tubules called interstitial spaces contain:
1) Small blood vessels
2) Interstitial cells or Leydig cells
3) Other immunologically competent cells - Leydig cells synthesise and secrete testicular hormones called androgens, also called male sex hormones.
Diagrammatic sectional view of seminiferous tubule
B) Accessory ducts:
- The male sex accessory ducts include rete testis, vasa efferentia, epididymis, and vas deferens.
- The seminiferous tubules of the testis open into the vasa efferentia through rete testis.
- The vasa efferentia leave the testis and open into epididymis located along the posterior surface of each testis.
- The epididymis leads to vas deferens that ascends to the abdomen and loops over the urinary bladder.
- Vas deferens receives a duct from seminal vesicle and opens into the urethra as the ejaculatory duct, that stores and transports sperm from the testis to outside via urethra.
- The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus.
C) Accessory glands:
- The male accessory glands include paired seminal vesicles, prostate, and paired bulbourethral glands.
- Secretion of all these glands are constitutively called seminal plasma which is rich in fructose, calcium, and certain enzymes.
- The secretions of bulbourethral glands also helps in the lubrication of the penis.
D) External genitalia:
- The penis is the male external genitalia.
- Penis is made up of special tissue that helps in erection of the penis to facilitate insemination.
- The enlarged end of penis called the glans penis is covered by a loose fold of skin called foreskin or prepuce.
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