Biology Handwritten Notes In Hindi
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Topics Include In Biology Handwritten Notes In Hindi
- तंत्रिका तंत्र
- परिसंचरण तंत्र
- रक्त वहिका
- हृदय ध्वनि (Heart Sound)
- हृदय के प्रकार
- हृदय आघात (Heart Attack)
- रक्तदाब (Blood Pressure)
- रक्त प्लाज्मा
- विभिन्न पदार्थों का PH मान
- रक्त कोशिकाएं
- लाल रुधिर कनिका
- ब्लड बैंक
- रक्त समुह
- परितन्त्र या इको सिस्टम के प्रकार
- इको सिस्टम के पिरामिड
- कंकाल तन्त्र
- मानव रोग
- श्वसन (Respiration)
- पदार्थ हार्मोन
- अम्लीय वर्षा
- Bhopal Gas Tragedy
- Chernobil Accident
- D.O ( Disolved Oxygen)
- BOD- Biological Oxygen Demand
- Green Muffler
- हरित गृह प्रभाव ( Green House Effect)
- ओजोन परत व ओजोन छिद्र
- प्रकाश संश्लेषण (Photosynthesis)
- द्विसंकर क्रॉस
- कोशिका का केंद्रीय सिद्धांत
- पादप – आकारिका
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Biology Handwritten Notes In Hindi
The nervous system is a complex network of nerves and cells in our body. They help in carrying messages from spinal cord to the brain and from the brain to the spinal cord and also to the various parts of the body.
The nervous system is of two types the Central nervous system and the Peripheral nervous system. The Central nervous system consists of the main control centers the brain and spinal cord and The Peripheral nervous system is further divided into Somatic and the Autonomic nervous systems.
The nervous system consists of all the nerve cells in your body. The nervous system is the reason that we are able to communicate with the outside world. The system also helps in controlling many mechanisms in our body at the same time. These are the few functions which are controlled by the nervous system on daily basis.
The nervous system helps in taking the information from the outside that is happening to our body.
Our senses help us to gather that information and then send it to the control panel- the brain.
The processing the information is done by the brain.
The signal or the message is sent by the brain which helps us in performing the certain action like making our muscles move or feel pain.
The brain lies protected within the skull. It is the most protected part of our body because it handles all the other functions going around in our body. The brain is in a shape of a mushroom protected with many layers. The brain consists of four principal parts that help with all the functions that need to be performed:
- The cerebrum
- The cerebellum
- The brain stem
- The diencephalon
The weight of the brain is approximately 1.3 to 1.4 kg. The brain is made up of the nerve cells called the neurons and they are the basic functional unit of the nervous system. They also consist of the supporting cells known as the glia.
The brain consists of two types of matter and they are known as: the grey matter and the white matter. They both have certain specific functions to perform.
Grey Matter- Grey matter helps in receiving and storing the impulses. The cell bodies of the neurons and neuroglia lie in the grey matter. They help in carrying a response from the site of stimulus to the brain.
White matter- White matter helps in carrying the impulses from the brain to the grey matter. It consists of numerous nerve fibers which are known as the axons.
The Cerebrum- The Forebrain
The cerebrum is the main bulk of the brain. The cerebrum is also supported by the brain stem and is divided into two hemispheres. Each hemisphere has a certain set of activities to control. They control the functions of the opposite side of the hemisphere. One hemisphere is divided into certain lobes and is later on divided into different parts.
The hemispheres are divided into these four lobes which help in recognition of the certain area and its function. These lobes are named according to the corresponding bone.
This is the biggest part of the brain and also makes up the 85% of the brain’s weight. The cerebrum is commonly known as the thinking part of the brain. It controls all the voluntary muscles of our body.
The cerebrum is the part where all our memories are stored- both the short-term memory and long-term memory. The cerebrum also helps you reason, and to figure out the solution to the problem in front of you.
Scientists believe that the right half helps you think about abstract things like music, colors, shapes and sizes. The left half is more on the analytical side and thus helps you with math, logic, reason and speech.
The midbrain is located below the middle of the forebrain. It is a master coordinator of the messages that go in and out of the brain to the spinal cord and to the whole body.
The hindbrain consists of the cerebellum, pons, and medulla. They all carry the vital functions of our body and thus are described below.
The cerebellum is located at the back of the brain and lies below the cerebrum. This part of the brain is of utmost importance as it helps in performing some of the most important functions like balance control, movement, and coordination.
The Brain Stem
The brain stem consists of all these parts-
Brain Stem- Breathing centre
The brain stem lies below the cerebrum like cerebellum but it lies on the front aspect. It helps in connecting the brain to the spinal cord. The brain stem is the control centre of all the functions of your body that are required to stay alive. These functions can be breathing air, circulating blood and digesting food. All the involuntary muscles are controlled by the brain stem.
The diencephalon is also termed as the forebrain stem. It includes the organs like the thalamus and hypothalamus. The thalamus is the part where all the sensory impulses coalesce together and the hypothalamus is a smaller part of the diencephalon.
The Spinal Cord
The spinal cord is a tube-like structure, and this structure extends from the brain and has series of 31 segments. Each segment of the spinal cord has a pair of spinal nerves that spread through the entire body. The region of the origin of the spinal nerves on the spinal cord is known as the spinal segment. These spinal nerves are also very important in handling all the functions of the body. They carry both the motor and the sensory nerves which are located on the spinal cord.
The spinal cord is 43 cm long in adult women and is little longer in males. It is about 45 cm long in adult men. The weight of the adult spinal cord is around 35-40 grams. Spinal cord also controls some of the major functions of our body and hence it also lies protected within the vertebral column. The collection of bones is known as the vertebral column and inside the spinal cord lies.
Topic name:-Biology Handwritten Notes In Hindi