Essays on Nerve Impulse

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) ...

Lesson 5 Answers:

24.) Plants are classified into four major groups: Bryophytes, Pteridophytes, Gymnosperms and lastly the Angiosperms. Bryophytes are the plants that do not have true vascular systems, which consist of the xylem and the phloem. In this group, includes the mosses, liverworts and hornworts. Together, they are considered as land plants that reproduce their own asexually by producing spores. Spores are produced in the ‘sporangium’ (plural sporangia), a bulb-like structure located at the top of the stalk. It can only be seen through the use of high powered microscope. Because they lack vessels that can bring the nutrients from the roots ...

Ahmad Al-Obaidly

Abstract—In this experiment, a hand dynamometer was used to measure the grip strength of a subject. The forearm muscles were engaged in an activity, and the grip recorded. The electromyogram (EMG) activity was related to the grip strength by making a graph of the maximum grip strength against area under the EMG activity’s absolute integral during the contraction of muscle. Data was recorded from the dominant and non-dominant forearms of the subject and the electrical activity of each forearm compared to its diameter. Prolonged grip strength was also recordings and forearm EMG activity made to determine fatigue rate in both ...

Abstract

The paper articulates the electrolyte and fluid study by describing functions and location of various body fluids and factors that affects variations in fluid compartments. These body fluids involves Body fluids involve blood plasma, mucus and lymphatic fluid, saliva and gastric juice, and other fluids such as tears, sweat, semen and vaginal secretions. The functions, regulation, sources and losses of the main electrolytes in the body are also described. The paper also outlines the basic principles of some of the processes that occur in human body such as osmosis, filtration, active transport and diffusion. In order to understand ...

a) Explain why the effort of hormonal (Endocrine ) control tends to be slow whereas nervous control is usually very fast.

Endocrine control is normally slower when compared to nervous control majorly because hormones once released by the endocrine gland have to travel via the circulation to reach their target receptors on the effector organ which generally takes more time. Meanwhile, information relayed by nerves is in form of impulses (that is, action potentials generated due to electrical excitation produced by a change in the charge across the surface membrane of the neuron evoked by the stimuli) that simply travel along the ...