Answer: Myelin Sheath. The Myelin Sheath of a neuron consists of fat-containing cells that insulate the axon from electrical activity. This insulation acts to increase the rate of transmission of signals. A gap exists between each myelin sheath cell along the axon.
Explanation:. Myelin can greatly increase the speed of electrical impulses in neurons because it insulates the axon and assembles voltage-gated sodium channel clusters at discrete nodes along its length. Myelin damage causes several neurological diseases, such as multiple sclerosis.
Explanation:
Earthquake waves produces two very important waves that useful in studying the composition of the earth.
These waves are P and S-waves.
- P-waves are primary longitudinal waves that propagates through any material medium.
- S-waves are secondary transverse waves that can only pass through solids but not fluids.
Using these waves we can know the composition of the earth.
<h2>C) option is correct </h2>
Explanation:
- The spinal cord has numerous groups of nerve fibers going towards and coming from the brain
- These have been collectively called the ascending and descending tracts of the spinal cord, respectively, these tracts are responsible for carrying sensory and motor stimuli to and from the periphery (respectively)
- The ascending tracts transmit sensory information from the sensory receptors to higher levels of the CNS
- The descending tracts originate from different cortical areas and from brain stem nuclei
- The descending pathway carry information associated with maintenance of motor activities such as posture, balance, muscle tone, and visceral and somatic reflex activity
1. Knowing our family’s medical history can be useful for us and our doctors because it can help to check the possibility of occurrence of genetic disorders. Genetic disorders are passed on through several generations. Diseases like hemophilia and color blindness are some examples.
2. Contaminated water can negatively affect the health of an individual as well as a community. Pathogens contained in contaminated water causes several diseases. Diseases like cholera and typhoid are examples of water-borne diseases.
The bacterium that causes typhoid is Salmonella typhi and the pathogen that causes cholera is the bacterium Vibrio cholera. The consumption of water contaminated by the feces of a person infected with cholera cause the spreading of disease to a healthy person. Contaminated water and poor sanitation is the cause of typhoid spread as well.
3. Two types of drugs are stimulants and hallucinogens. Stimulants increase the alertness of the person who uses it and increases the heart rate, blood pumping rate and blood glucose levels. Cocaine is an example of stimulant drug.
Stimulant abuse can lead to anxiety, paranoia, depression etc. hallucinogens disconnect the link to the brain and users experience unstable and rapid emotions and have hallucinating visions.LSD is an example of hallucinogen. Hallucinogen abuse can cause cognition distortions, paranoia, anxiety etc.
Answer: open and globular
Explanation: The two major types of star clusters are open clusters and globular clusters.
