DENTAL FORMULA
[Photo credit: Dozenist]
Dental formula can be defined as the number and types of teeth an animal has in one half of each jaw. Different mammals have different dental formulae depending on their diet. In the following formula...
Saturday, 16 July 2016
Feeding, Digestion and Dentition in Mammals
The solid food most animals eat is usually large, and must first be broken down into small molecules in the alimentary canal before it can be absorbed in the blood stream. This is usually done mechanically and chemically in mammals. ...
Thursday, 14 July 2016
Feeding Mechanism and Modifications in Some Animals
There are five modifications and mechanisms of feeding associated with some organisms. These feeding mechanisms include:
1. Biting and chewing mechanism e.g. grasshopper or cockroach: The grasshopper or cockroach has mouth parts adapted for biting and chewing.
[Photo credit: Fir0002. License: GFDL. Released under GFDL v1....
Wednesday, 13 July 2016
Digestive System of Rabbit and Other Herbivores
DIGESTIVE SYSTEM OF RABBIT
[Photo credit: Larry D. Moore. License: CC-BY-SA 3.0]
The teeth of herbivores are adapted for cropping grass and grinding plant matter to break down the cellulose cell walls. The incisors of a rabbit are long and chisel-shaped. They bite against each other to chop off pieces of gras...
Digestive System or Alimentary Canal of Man
The alimentary canal is a long tube stretching from the mouth to the anus. The digestive system or alimentary canal of man includes: the mouth, oesophagus, stomach, duodenum, small intestine or ileum, caecum, appendix, large intestine or colon, rectum and anus.
[Photo credit: Bruce Blaus]
The description and importance of the parts are as follow...
Digestive System of Planaria, Tapeworm, Amoeba, Earthworm, Insects and Bird
DIGESTIVE SYSTEM OF PLANARIA
[Photo credit: PlanMine]
The planaria is a free-living flatworm that feeds on aquatic animals called zooplanktons. It has a simple alimentary canal with one opening - the mouth. The mouth opens into a short buccal cavity which leads into the pharynx.
The pumping action of the pharynx sucks in pieces of food which enter the pharynx...
Tuesday, 12 July 2016
Digestion, Digestive System and Feeding Mechanism
Digestive System includes the alimentary tract or canal and all the organs and glands associated with the digestion and assimilation of food in animals.The digestive system varies from one animal to another, Organisms from simple to complex ones have different types of digestive systems or alimentary tract.
Animals have different types of alimentary tracts which vary in...
Excretory System of Plants
Plants have no special excretory organs because their metabolic waste products are minimal. Plants manufacture their own food, i.e they are autotraphic. The waste materials are disposed off through various parts of the plant.
[Photo credit: Estreya]
Plant wastes products include water, carbon dioxide oxygen, acids, resins, mucilage, latex, alkaloids, crystals of salts,...
Monday, 11 July 2016
EXCRETORY SYSTEM OF MAMMALS: Structure and Mechanism of Excretion of the Kidney and Urinary Tubule
EXCRETION IN MAMMALS
[Photo credit: Jordi March i Nogué]
In mammals, there are four excretory organs:
lungs, which excrete water vapor and carbon dioxide;
skin, which excretes water, salts and urea through sweat;
liver, which excretes bile pigments called bilirubin; and
kidneys, which excrete water, mineral salts, urea, uric acid, and creaunine.
EXCRETORY SYSTEM...
Excretory System and Mechanism of Excretion in Earthworm, Flatworm, Insects and Amoeba
EXCRETORY SYSTEM OF EARTHWORM
[Photo credit: KDS444. Earthworm_head.svg from wikipedia commons. License: CC-BY-SA 3.0]
An earthworm has a segmented body. Each segment of the body except the first three and the last segment has a pair of tubes called nephridia. The nephridia are the excretory organs of the earthwor...
Sunday, 10 July 2016
EXCRETION: Definition, Importance, Need for Excretory Systems, Organisms and Their Excretory Organs, Excretory Organs and Their Waste Product
Excretion can be defined as the process by which metabolic waste products are removed from the body of living things. Waste product from metabolic activities are always produced by the bod and their removal are carried out by special excretory systems or organs.
[Photo credit: Hämbörger. License: GNU Free Documentation Licens...
Respiratory System in Plants
Plants carry out gaseous exchange for: photosynthesis and cellular respiration.
[Photo credit: Yvan Lindekens]
Photosynthesis is the process by which green plants manufacture their food, making use of carbon dioxide and water in the presence of sunlight....
Saturday, 9 July 2016
Respiratory System in Mammals
The most complex respiratory system is found in mammals. Most vertebrates, including birds, lizards and mammals use the lungs as their only respiratory organs where gaseous exchange takes place.
LUNGS
[Photo credit: Patrick J. Lynch, medical illustrato...
Friday, 8 July 2016
Supporting Tissues in Plants, Their Mechanisms and Their Functions
SUPPORTING TISSUES IN PLANTS
[Photo credit: Emmanuel]
Plants generally are known to possess supporting tissues which give them definite shape, strength, rigidity and resistance against external forces such as wind and water to which they are continuously subjecte...
Thursday, 7 July 2016
JOINTS: Definition, Types, Structure, and their contribution to movement
A joint is a place or region where where two more more bones meet or articulate. Movement is made possible with the aid of joints and muscles. Joints are always held together by strong ligaments which prevent dislocation during movement. Ligaments join bones together.
[Photo credit: Madhero]
TYPES OF JOIN...
Monday, 4 July 2016
Appendicular Skeleton
Appendicular skeleton, together with axial skeleton, makes up the skeletal system.
The Appendicular skeleton is a skeletal system, which consists of the girdles and the bones of the limbs. The girdles consist of:
pectoral girdles and
pelvic girdles
while the limbs consists of:
fore limbs and
hind limbs
...
Axial Skeleton
The skeletal system in mammals are grouped into two parts: Axial skeleton and Appendicular skeleton.
The axial skeleton is a skeletal system, which consists of the skull, vertebral column, the ribs and sternum.
THE SKU...
Sunday, 3 July 2016
SKELETON: Forms, Components, Types and others you need to know
Skeleton can be defined as the bony framework of the body, which provides support, shape and protection to the tissues and organs in animals. It enables movement in animals. Without skeleton, movement or other life processes may not be possible in animals.
[Photo credit: Skimst...
Saturday, 2 July 2016
Transport System in Plants
As I discussed in an earlier post about means of transport system, the medium or means of transport in plant is latex or cell sap and the materials transported are water, carbon dioxide, oxygen, amino acids, e.t.c. Plants require sufficient quantities of several minerals and other substances which are transported in them.
[Photo credit: Smartse...
