NEURONE; INTRODUCTION, STRUCTURE, CLASSIFICATION, FUNCTIONS, TRANSMISSION OF NERVE IMPULSES, REFLEX AND VOLUNTARY ACTIONS, CONDITIONED REFLEX

A neuron is the functional unit of the nervous system. It consists of a cell body containing a nucleus, and cytoplasm, the dendrites and the axon. The axon or the nerve fibre and dendrites are extensions of the cell body. The dendrites are short branched fibres while the axon is a single long and slender … Read more

NERCOUS COORDINATION: INTRODUCTION, DIFFERENCES, COMPONENTS, ORGANIZATIONS, CENTRAL NERVOUS SYSTEM, PERIPHERAL NERVOUS SYSTEM

The nervous system detects and interprets changes in conditions inside and outside the body and responds to them. All nervous system activities consists of signals passed through pathways of inter connected neurons. Thus nervous co-ordination is the transfer of messages round the body of an organism means of nerves. The nervous system and the endocrine … Read more

REGULATION OF THE INTERNAL ENVIRONMENT: HOMEOSTASIS, KIDNEY, THE MAMMALIAN LIVER,

Every organism is faced with conditions that are constantly changing. Such conditions may be internally or externally. For an organism to survive, it must have to adjust to all these changing conditions. It must maintain a state of balance between its life activities and the conditions that affect such activities. For example, a human being … Read more

HORMONES: EXAMPLES, TYPES, AUXINS, THE MAMMALIAN SKIN

Hormones are secretions of ductless or endocrine glands which are poured or secreted directly into the bloodstream by diffusion and they affect organs that respond to their actions. Examples of animal hormones are thyroxin, adrenaline, insulin and sex hormones. ENDOCRINE SYSTEM The system consists of a collection of hormones producing glands, many regulated by trophic … Read more

ECOLOGY OF POPULATION: INTRODUCTION, OVERCROWDING, FACTORS AFFECTING A POPULATION, BALANCE IN NATURE, FAMILY PLANNING

Population is the number of individuals of the same species interacting in a habitat at the same time. This individuals cohabit cohabit and compete virtually for everything ranging from food, water, dominance, territories, etc. When individuals compete, there are chances that the most viable ones will remain and the weaker ones will be dominated upon. … Read more

HABITATS: INTRODUCTION, TYPES, MAJOR ZONES, CHARACTERISTICS

Habitats are natural places in our environment. These habitats play important roles in contributing to the wellness of plants, animals, organisms living in them and eventually man. There are different habitats known to man and they are Aquatic habitats, Terrestrial habitats, Grassland or Savannah, and Arid land. AQUATIC HABITAT The aquatic habitats include marine, estuarine, … Read more