Human Brain and it's parts.

Brain: -

Brain is defining as an organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.

Parts of the Brain:

Protected within the skull, the brain is composed of the cerebrum, cerebellum, and brain stem. The brain stem acts as a relay center connecting the cerebrum and cerebellum to the spinal cord.

The brain receives information through our five senses: sight, smell, touch, taste, and hearing - often many at one time. It assembles the messages in a way that has meaning for us, and can store that information in our memory. The brain controls our thoughts, memory and speech, movement of the arms and legs, and the function of many organs within our body. It also determines how we respond to stressful situations (such as taking a test, losing a job, or suffering an illness) by regulating our heart and breathing rate. 

The brain is composed of three parts: the brain stem, cerebellum, and cerebrum. The cerebrum is divided into four lobes: frontal, parietal, temporal, and occipital.

The cerebrum is the largest part of the brain and is composed of right and left hemispheres. It performs higher functions like interpreting touch, vision and hearing, as well as speech, reasoning, emotions, learning, and fine control of movement. 

The cerebellum is located under the cerebrum. Its function is to coordinate muscle movements, maintain posture, and balance. 

The brain stem includes the midbrain, pons, and medulla. It acts as a relay center connecting the cerebrum and cerebellum to the spinal cord. It performs many automatic functions such as breathing, heart rate, body temperature, wake and sleep cycles, digestion, sneezing, coughing, vomiting, and swallowing. Ten of the twelve cranial nerves originate in the brainstem.

Read More

What is Anatomical Position?

The erect position of the body with the face directed forward, the arms at the side, and the palms of the hands facing forward, used as a reference in describing the relation of body parts to one another.

Read More

The Human Nervous System

In humans and other vertebrates, the nervous system can be broadly divided into two sections: the central nervous system and the peripheral nervous system.

The central nervous system (CNS) consists of the brain and the spinal cord. It is in the CNS that all of the analysis of information takes place.

The peripheral nervous system (PNS), which consists of the neurons and parts of neurons found outside of the CNS, includes sensory neurons and motor neurons. Sensory neurons bring signals into the CNS, and motor neurons carry signals out of the CNS.

The cell bodies of some PNS neurons, such as the motor neurons that control skeletal muscle (the type of muscle found in your arm or leg), are located in the CNS. These motor neurons have long extensions (axons) that run from the CNS all the way to the muscles they connect with (innervate). The cell bodies of other PNS neurons, such as the sensory neurons that provide information about touch, position, pain, and temperature, are located outside of the CNS, where they are found in clusters known as ganglia.

The axons of peripheral neurons that travel a common route are bundled together to form nerves.

Read More

Define cell? Mention the function of cell membrane?

The cell comes from the Latin word Cella Meaning "small room". It's can be define as the 

• Basic structural, functional and biological unit of all known organisms.
• Replicate independently 
• Building blocks of life                          

It's typically microscopic and consist of cytoplasm enclosed within a membrane which contains many biomolecules such as protein and nucleic acid.

Function of the cell membrane: 

1.  Maintains the physical integrity of the cell
2. Forms a barrier between the inside of the cell and the environment outside the cell
3.  Physically separates the intracellular components from the extracellular environment
4. Cell membrane also helps to hold the cytoskeleton
5.  Protects the cell from some harmful chemicals in its external environment
6. Protects the cell from loss of useful biological macromolecules
7. Selective Permeability
8. Active Transport
9. Markers & Signaling  (for communication with other cells & the external environment)
10.  Metabolic Activities
11. Bulk Transport: Exocytosis and Endocytosis



Ref: http://www.ivyroses.com/Biology/Cells/Cell-Membrane-Function.php

Read More

WHAT IS COMPUTER?

A computer is a device that accepts information (in the form of digitalized data) and manipulates it for some result based on a program or sequence of instructions on how the data is to be processed. Complex computers also include the means for storing data (including the program, which is also a form of data) for some necessary duration. A program may be invariable and built into the computer (and called logic circuitry as it is on microprocessors) or different programs may be provided to the computer (loaded into its storage and then started by an administrator or user). Today's computers have both kinds of programming.

Read More

TENSE

In English Grammar Tense is used to refer to time of an action or event.
Tense is the concept of time which may be present, past or future.
কোন কাজ সম্পাদনের সময়কে tense বা কাল বলে। Tense দ্বারা সময়কে উল্লেখ করা হয় এবং যা বর্তমান, অতীত কিংবা ভবিষ্যত হতে পারে।
Example:
- I eat rice. (present)
- I ate rice. (past)
- I will eat rice. (future)
এখানে উপরের বাক্য গুলোতে যথাক্রমে বর্তমান, অতীত ও ভবিষ্যৎ কাজের কথা নির্দেশ করে।
Types of Tense:
The concept of time (tense) can be differentiated into three categories.
The present / simple present tense. (what are you presently doing )
The past.(What you did some time back).
The future. (What you will do some time later).

And all of these tense are differentiated into the following four categories.
Indefinite Tense
Continuous Tense
Perfect Tense
Perfect Continuous Tense

Read More

INTRODUCTION TO ATOM

Introduction to the atom : The atom, proton, neutron and electron

Read More