Use complete sentences to explain what happens in the nervous system when your finger is hurt. Include an explanation of what a neuron is.

Neurons are the cells that are an essential part of the nervous system and sends and receives nerve impulses from the external world to the brain and spinal cord and then to muscles. Neurons transmit signals between various parts of the nervous sytem.

If an individual experiencing tissue damage in his finger it will activate nociceptors that are special types of receptors for pain present in the skin. These receptors send signals or nerve impulses to the peripheral nerve to the spinal cord with the help of sensory neurons where neurotransmitters are released.

Chemical signals activate the nerve signals in the brain that are processed relayed to the frontal cortex for thinking, the somatosensory cortex for sensation, and the limbic system for the response.

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.