Pituitary gland (The master gland)
The endocrine system is made up of tissues or organs (collectively called glands) which secrete a chemical substance called hormone. Hormone is a specialized chemical […]
Anatomy and Physiology
Chromosomes (Structure, types, functions and disorders)
Chromosomes The nucleus of eukaryotic cells consists of a thin reticulate complex of DNA and proteins (histone), which are not distinctly visible in a non-dividing […]
The human heart (External and internal structure)
The human heart In all vertebrates including human beings, there is a single heart which acts as a pumping organ of blood vascular system. It […]
Blood cells (Types and functions)
Blood cells The blood cells constitute about 45% of the total blood volume. There are three major types of blood cells; Erythrocytes, Leukocytes and Thrombocytes. […]
Hormonal regulation of ovulation and menstruation in women
The male is continuously fertile from puberty to old age and sex hormones are secreted throughout that period in a constant rate. However, in case […]
Blood vessels (Types, structure and functions)
Blood vessels Our circulatory system is of closed type. i.e. blood flows within blood vessels which are network of closed tube like structures with walls. […]
Blood and plasma (Appearance, composition and functions)
Blood An average adult person has about 4-6 liters of blood, which forms about 8% of the body weight. The study of blood is called […]