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Nervous System
This category is for questions about the mechanical and chemical process of reactions to internal and external stimuli, ranging from the brain down to the spinal cord, and all nerves, cells and tissues in between.
3,047 Questions
What type of nervous system do invertebrates have?
Nervous responses in Cnidarians are controlled by a diffuse web of interconnected nerve cells called a nerve net.
Parasympathetic
Why do people get nervous when they are on stage?
you shouldn't be nervous on stage because when your singing you might sound bad or when you are on stage you might be really nervous and start shaking
What two structure make up the central nerves system?
The brain and the spinal cord are the 2 things that make up the central nervous system. The central nervous system is part of the nervous system as a whole.
What is the pathway between the receptor and the control center in the reflex pathway called?
Afferent pathway
How many nerves are in the human foot?
Dorsal digital nerves of foot are branches of the intermediate dorsal cutaneous nerve, medial dorsal cutaneous nerve, sural nerve and deep fibular nerve. There are 10 total dorsal digital branches.
Neurons are electrically excitable cells in the nervous system that process and transmit information. Neurons are the core components of the brain, the vertebrate spinal cord, the invertebrate ventral nerve cord, and the peripheral nerves. A number of different types of neurons exist: sensory neurons respond to touch, sound, light and numerous other stimuli effecting sensory organs and send signals to the spinal cord and brain, motor neurons receive signals from the brain and spinal cord and cause muscle contractions and effect glands, Interneurons connect neurons to other neurons with in the brain and spinal cord.
With this in mind there are an approximate figure of 7,800 nerve's in the foot.
The hands, feet, head and extreme endings of the human anatomy are where the bulk of nerve endings are found, which connect back to the central nervous system and Peripheral Nervous System, the figure there is in the region of 3 billion nerves total.
This is an intermediate response to the question and needs further explanation to fully understand the complexity of the human anatomy. The foot in particular is very complex and has a very advanced bone structure. In the case of extreme damage to the foot, option's for remedy include, bone fusion, muscle and skin grafting, vascular redirection and of course prosthetic's.
Having been shot with a 12 gauge shotgun at point blank, the human foot is capable of being saved by a combination of all the afore mentioned technique's, with amputation being the very last alternative. This is however dependant on the factor's of distance of blast impact and the magnitude of damage caused to the foot and the individual's ability to overcome and withstand associated pain and trauma, which in this proposed scenario would be an extreme and hence difficult to gauge.
It is perhaps also important to note that bone's can be lengthened and shortened by surgical procedure. The loss of a "Talus" bone would incur a depreciation in height of 1 and 1 half inch. The talus is the second largest of the tarsal bones.
Bones and nerves are interconnected in a very complex manor. It is important to note that nerve endings, when damaged are capable of regeneration although this is also dependant on the age and physical status of the individual.
bilateral nervous system
What are same of the harmful substances that are likely affect your brain?
- Some of the harmful substances that can affect our brain are cigarettes, illegal drugs, marijuana, weeds , shaboo or methamphetamine...
- Hope it will Help you. :))
What are functions of nociceptors?
Nociceptors are a group of cells that senses painful stimuli and sends these nerve signals to the brain and the spinal cord. It has been documented that both mammals and non-mammals have nociceptors that respond to thermal, mechanical or chemical stresses.
State why there is a brief delay in the transmission of an impulse across the synapse?
The impulse must go from one neuron to the next. To do this, it must change from an electrical to a chemical signal, and back to an electrical signal when it reaches the next neuron. Electrical signals are impossibly fast, but neurotransmitters cannot cross a synapse that fast. So, the impulse is at its slowest point when it crosses the synapse.
How do the nervous system and the endocrine system complement each other?
The nervous and endocrine systems are related in three main areas, structure, chemical, and function. The endocrine and nervous system work parallel with each other and in conjunction function in maintaining homeostasis, development and reproduction. Both systems are the communication links of the body and aid the body's life systems to function correctly and in relation to each other.
Structurally many of the endocrine systems glands and tissues are rooted in the nervous system, Such glands as the hypothalamus and posterior pituitary are examples of nerve tissues that influence the function of a gland and it's secretion of hormones. Not only does the hypothalamus secrete hormones into the bloodstream, but it regulates the release of hormones in the posterior pituitary gland. Those that are not made of nervous tissue once were. The adrenal medulla is derived from the same cells that produce certain ganglia.
Chemically both the endocrine and nervous system function in communication by means of the same transmitters but use them in different ways. Hormones are utilized by both systems in signaling an example of this can be seen in the use of Norepinephrine. Norepineprine functions as a neurotransmitter in the nervous system and as an adrenal hormone in the endocrine system.
Functionally the nervous and endocrine system work hand in hand acting in communicating and driving hormonal changes. They work in maintaing homeostasis and respond to changes inside and outside the body. Besides functioning in similar manners they work in conjunction. An example of this can be seen in a mothers release of milk. When a baby sucks the nipple of its mother, sensory cells in the nipple sends signals to the hypothalmus, which then responds by releaing oxytocin from the posterior pituitary. The oxytocin is released into the bloodstream where it moves to its' target cell, a mammary gland. The mammary gland then responds to the hormones signal by releasing milk through the nipple. Besides working in conjunction with each other, both systems affect one another. The adrenal medulla is under control the control of nerve cells, but the nervous systems development is under the control of the endocrine system.
What are the effectors of a reflex arc?
Muscles and glands are the possible effectors of a reflex arc
Two cranial nerves involved in taste are?
facial nerve`s branch - Chorda tympani provides parasympathetic innervation to submandibular gland and sublingual gland and special sensory taste fibers for the anterior 2/3 of the tongue
glossopharyngeal nerve whitch receives special sensory fibers (taste) from the posterior one-third of the tongue
What are the 5 types of reflex action?
Porilteation systmy. manaractioin of and reaction compinds with the andcreatsir that will prove that the human reaction type. the 5 reflex action is a polarication and will spare and exraction and will privede saysrmad that will come.
The 5 types of reflex action is.
1) The columents system will react faste as you know what you are doing.
2) reaction of your eyes so you will see what you are doing.
4) see what your doing in an insteant.
5) recover from what you see and doing and a reaction time that is friar andasrtment from your eyes and hand to see the reaction for example you a stop watch you will need fast reaction time to make your caluation right.
In your parasympathetic nervous system was activated what might you be doing?
When the parasympathetic nervous system is activated, you might be engaged in relaxing activities such as deep breathing, meditating, or enjoying a calm meal. This state promotes rest and digestion, often leading to a slower heart rate and decreased blood pressure. You might also feel more focused on self-care, such as taking a warm bath or reading a book in a quiet environment. Overall, it fosters a sense of calm and restoration.
Which systems provide a benefit to the nervous system?
the skeletal and muscular system provide a benefit to the nervous system. without them, when your brain tells you to reach for a cup, those systems wont be there to physically do the action.
How does a paralysis affect the nervous system?
The lower extremities are most easily and readily affected. The foot drop from cerebral palsy and Parkinson's Disease, and the neuropathies from Diabetes and Alcoholism all affect the lower extremities before any other part of the body.
What may cause you to stagger when walking?
If you are feeling unsteady it is very important that you should go and see a qualified medical practitioner (a doctor) as soon as possible.
What is the specific life function of the nervous system?
The nervous system is very important because it relays all messages from the brain, which is the control center of the body, to the rest of the organs in the body. The nervous system is divided into two main systems much as the skeleton is divided into two main skeletons. The central nervous system is composed of the brain and spinal cord, which is a bundle of nerves that is contained within the vertebral column. The peripheral nervous system is composed of all the nerves that deliver the messages sent down the spinal cord to the appropriate destination.
The nerves of the body are composed of cells called neurons (pictured left). Sensory neurons relay sensory information gathered from a certain part of the body back to the brain. Motor neurons send messages to the correct muscle or gland that needs to be stimulated. Interneurons are neurons that serve as relays between other neurons.
Each neuron has three main parts: the body, axon, and a number of dendrites. The axon is the part of a neuron that transfers the appropriate message, information on potential, to another nerve, muscle, or gland. When a message from the brain is sent down the spinal cord to a peripheral nerve and finally to its destination, a quick relay process is used to deliver the message. The message is sent throught the appropriate nerves by passing the information from neuron to neuron. When the first neuron receives the message, it immediately passes the information to the next neuron in line. This is achieved through the action of neurotransmitters, chemicals which allow the message from the brain to cross the synapse between cells. This process continues down the spinal cord and through the other nerves until the message reaches its destination. In the case of a reflex action, the message provided by the sensory neurons never actually gets processed by the brain, but is actually returned by the spinal cord with a certain pre-determined response. This process happens very quickly, but slows with age and other factors. The time which information takes to be sent to the brain by sensory receptors, processed by the brain, and to have the appropriate return message processed is commonly referred to as a person's reaction time.
Major Nerves of the Body:
- Thoracic/Abdominal Region: 8 Cervical nerves
12 Thoracic nerves
5 Lumbar nerves
5 Sacral nerves
- Arms Musculocutaneous nerve
Brachial plexus
Median nerve
Radial nerve
Ulnar nerve
- Pelvic Region/Legs: Sacral plexus
Femoral nerve
Sciatic nerve
Common peroneal nerve
Tibial nerve
What training activities would improve the nervous system?
It is expeculated that meditation can help,but it has not been proved.
What does the perephrial nervous system do?
It is more of a "supplementary" nervous system.
It can perform many jobs that keep your body in tune. Veins and nerves are often part of this system.
