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Important Biology Notes on Human Blood Blood is a bodily fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Blood contains antibodies, nutrients, oxygen and much more to help the bodywork. Let us have a look at the Composition of Human Blood in detail.  Human Blood The blood constitutes  7% of the total weight of the human's body . Its pH value is nearly 7.4, so it is considered base in nature. There is an average of  5-6 litres of blood in the human body. Blood consists of two parts:- (1) Plasma (2) Blood Corpuscles (1) Plasma It is the  liquid part  of blood. It constitutes 60% part of the blood. The plasma has 90% parts is water, 7% protein, 0.9% salt and 0.1% is glucose.  Its main function is to Transport of digested food, hormones, the excretory product from one part of the body to another part of the body. When Fibrinoge...

Nervous tissue: Neuron and Neuroglia Nervous tissue  contains densely packed  nerve cell ( neuron) ,which are specialized for nerve impulse conduction. Origin-  ectoderm Nervous tissue consists of Neuron or nerve cell  (functional unit of Nervous system) Neuroglia (glial cell) Neuron: About 100 billions of neurons are present in nervous system. They are Specialised type of cell, they vary in shape and size, all neurons contains three principle parts-  cell body, dendrites and an axon Cell body Has a large nucleus, which contain prominent nucleolus, as well as other several structures (Nissl bodies, ER,lysosome, mitochondria, neuroflament), responsible for metabolism, growth and repair of neuron Nissl bodies-  made up of RNA, RER and free ribosome, help in protein synthesis Neurofilament and neurotubules  are thread like protein, runs parallel to long process Neurofilament-  semisolid structure that provide skeletal ...

Human Eye: Anatomy, parts and structure The eye is the photo-receptor organ. Size and shape:  Human eye is spherical about 2.5 cm in diameter. Location:  it is situated on an orbit of skull and is supplied by optic nerve. There are 6 sets of muscles attached to outer surface of eye ball which helps to rotate it in different direction. Four sets of these muscles are straight muscles; superior, inferior, medial and lateral rectal muscle and two sets are oblique muscles; superior and inferior oblique muscles. Structurally two eyes are separated but some of their activities are coordinated so that they functions as a pair. Anatomical structure of Eye Eye ball consists of three layers Outer fibrous layer: Sclera, cornea and conjunctiva Middle vascular layer: ciliary body, choroid and iris Inner layer: retina I. Outer fibrous layer: It consists of following parts. 1. Sclera: It is outermost supporting layer consists of thick membrane of tough fibrous c...