Simple Biology

  MODES OF REPRODUCTION USED BY SINGLE ORGANISMS                                                            Part 1 The modes by which various organisms reproduce depend on the body design of the organisms. Unicellular organisms reproduce by means of following processes:- Fission:-   Fission is the process of spliting of unicelluar organisms or single celled organisms into the two are more than two cells, each cell forms the new individual. The new individual formed is exact copy of parent cell. Fission is of two types:-            A) Binary Fission:-  when the single parent cell divides into two new daughter cells, each new                                                ...

Excreation:-  The process of removal of metabolic wastes from the body of an organism is called as Excreation. The full fludged system is concerned with the removal for metabolic wastes known as excreatory system.   Here we will descuss Human excreatory system. In Human beings the excreatory organ is kidney. There are two kidneys in human beings, named as left and right kidney. These two kidneys filter the blood taking wastes out from the blood. The kindneys are bean shaped. Nephron is the structural and functional unit of kidney. Renal artery is a blood vessel which supplies blood to the kidney for filteration. The filtered blood is taken to the heart through Renal vein. Ureter:- Each kidney has a narrow, whitish, tubular struction about 25 to 30cm long called "Ureters" opening in a somewhat pear shaped muscular sac like structure called " Urinary Bladder"  Ureters carry metablic waste "urine" from their respective kidneys to the Urinary...

Reproduction In Human Beings Reproduction:- It is the biological process in which organisms give offspring for the continuity of race. A complete system is concerned to perform this function called reproductive system. Here we are going to discuss sexual reproduction in Human Beings. As we human beings are diocious i.e male and female sexes are separate Male reproductive system in Human Beings. Testis:- These are the primary sex organs of males, testis produce male sex cells (sperms) as well as male sex hormone testosterone. Testis lie out side the body between the lungs in a muscular pouch called Scrotum.Scrotum maintains the temperature of testis which is below 3℃ than body temperature. Testis are two in number. Alongside the testicles are the  epididymis   and the  vas deferens.  which make up the duct system of the male reproductive organs. The vas deferens is a muscular tube that passes upward alongside the testicles and transports the sperm-...

Structure of Human Brain Human brain is well protected in a cranium cavity, in a skull. The Human brain has 3 membranes called Meninges. The space between the 3 membranes is filled with the fluid called Cerebro-spinal fluid which protects the brain from mechanical shocks. Brain is divided into three regions 1. Fore Brain:- It is further divided into 3 parts • Cerebrum:- It is the main thinking part of the brain. It is the center of intelligence, Memory, consciousness, willing power and voluntary actions. • Thalamus:- It relays pain and pressure impulses to the cerebrum. •  Hypothalamus:- It controls body temperature and secretion of Pituitary gland. 2. Mid Brain:- It doesn't have any further divisions. It controls reflex movements. 3. Hind Brain:- It has 3 regions • Cerebellum:- It balances body. • Pons Verolii:- It connects cerebrum with cerebrum, and transfer messages in between them. • Medulla:- It controls involuntary activities of body e.g breathing...

Neurons (nerve cells) are the functional units of the nervous system.  A typical neuron is divided into three parts i.e Cell body or Soma,Some contains all the cell organelles like Nucleus, Mitochondria etc. Dendrites and Axon. Schwann cells of Axon are covered by Myelin Sheath. Dendrites are branched like structures on Soma. Axon terminal is also branched like structure. The signals are received from neuron by dendrites and are send to next neuron bye chemo-electrical impulses through axon. The junction between the two cells is known as Synapses.In neuron signal travels in the form of chemicals but at synapses in changes in to electrical impulses.

Nervious System In Human Beings Central Nervous system includes the brain and spinal cord. The brain and spinal cord are protected by bony structure, membranes and fluids. The brain is held in cranial cavity or Skull. Funtion of Nervous system:- The function of nerous system is to gather information from different parts of body to the brain, where the brain analysis this data and sends message to that particular region/part of the body to take action. Here comes both an internal and external environment of body. Working .. The messages are taken from the site to the brain through neurons and the message from the brain to the site is also carried by neurons. The neurons which take information from the site ti the brain are known as Sensory nervous and the neurons which take information from brain back to the site are know as Motor nervous. Structure and functioning of Neuron  Click Here