Essays on PNS

Describe how a nerve impulse is transmitted from one neuron to the next

The transmission from one neuron to another is characterized by exchange of electric charge across the membrane of each neuron (Fields, 2014). An unstimulated neuron would be polarised (McCance 2014). In the polarized state, there is difference in the electric charge across the membrane. However, during exchange, a neuron is said to undergo polarization, wherein there is an excess of Na+ (sodium ions) outside and excess of K+ (potassium ions) on the outside (Fields, 2014). Nerve impulse is transmitted through the process of polarization, repolarization, and hyperpolarization (McCance 2014).

Compare the structure and functions of the CNS and PNS.

The nervous system comprises of the central nervous system (CNS) ...

The Corpus Callosum is the largest commissure, which facilitates communication between the right and left hemispheres of the brain. The views on the value of the Corpus Callosum are varied: from the most "useless" to those defining the higher cognitive functions of human brain structure. According to modern concept, the role of Corpus Callosum is not limited to the transfer of information. This commissure enables meta-control of the information in both hemispheres, as one of them must establish the function of its processing (Banich, 1995). Corpus Callosum not only transmits sensory information, ensuring its double representation in every hemisphere, ...

Abstract

The immune and nervous systems are two body structures that have different functions. Moreover, most people may not be able to readily identify the and the relationship between these two. While the immune system is responsible in protecting the body from destructive and invading pathogens, the nervous system is tasked to relay information to the brain. This process allows for the proper coordination of the different functions of the body. In general, the concept of the connection between the nervous and the immune systems stems from the theoretical idea of stress. Stress is denoted both as a physiological and ...

The nervous system (NS) denotes a collection of human body organs as well as connections, which have expressly differentiated cells referred as neurons or other specialized biochemicals, tissues, and supportive cells that assist in the normal working of the human body NS (Swanson, 2015). The human nervous system helps in addressing acquisition, processing, understanding, storing, as well as coordinating or transmitting signals in the body. Therefore, many body organs, as well as sensory organs, possess discrete and different roles. The nervous system (NS) can be categorized into two, that is, peripheral nervous system (PNS) as well as central nervous ...

Chapter #16:

Question 1. Insect-eating birds will decrease in number since their source of food has been reduced. The birds may also migrate to warmer areas during this period.

Question 2.

The habitat is the specific place where the organism lives e.g. a fish’s habitat is water. On the other hand, niche is the position and the role played by the organism in an ecosystem. It includes how the organism obtain food and shelter, the mode of survival, and the mode of reproduction (Sutton & Anderson, 2009, p. 46). For instance, a lion’s niche in the ecosystem is that of a predator.Question ...

The nervous system (speaker notes)

The NS is a network of neurons (specialized cells) that links different body parts to coordinate their activity. The system is divided into the Central nervous system (CNS) and the peripheral nervous system (PNS) which consist of the sensory and somatic nerves. The NS transmits messages between the body parts by electrical and chemical (neurotransmitters) signals. Generally sensory nerves transmit signals from sensory organs to the brain while motor nerves transmit signals from the brain to the muscles and the glands (effectors) (Guytona & Hall, 2006).

The CNS consists of the brain and the spinal cord. While the brain receives signals ...