Talk:Muscles of respiration

Terminology
respiration is the process that occurs within the cells. It is a chemical reaction. respiration is different from breathing, although the two processes are liniked through oxygen. This is what I teach my Primary School children. Am I wrong? The article shoul be headed The Muscles of Breathing — Preceding unsigned comment added by 92.3.54.243 (talk)

'Respiration' can refer to the entire process of oxygen supply and CO2 expulsion, and the sub-cellular reactions that utilise the oxygen and generate the CO2. This includes both breathing and cellular processes. However, the latin origin of the term is 'respiratio', which refers more specifically to breathing, and the use of the term 'respiration' to refer to breathing is widely accepted. Also, the term 'muslces of respiration' is more widely accepted than alternatives such as 'muscles of breathing' or 'muscles of ventilation'.

Serratus posterior inferior is categorized under "accessory muscles of inspiration". It's action is forced expiration. Please, someone more eloquent than I fix that if it's incorrect as is. JT —Preceding unsigned comment added by 74.64.73.122 (talk) 07:33, 14 November 2010 (UTC)

The introduction to this page references the terms "Interchondral" and "Intercondral", yet makes no further reference to these in the page. Can someone with greater knowledge about this ensure that the correct term is used and explained further. 2.220.6.246 (talk) 14:21, 13 August 2013 (UTC)

Expiration
Normal expiration is 'passive' meaning that no active muscle contraction is required to provide energy during this phase. The energy for expiration comes from the stored elastic energy in the lungs that is added to the lungs during the previous inspiration.

In essence, inspiration 'stretches' the spring of the lungs, and with expiration when the inspiratory muscles have relaxed, the elastic energy in the spring (stretched lungs) is used to increase alveolar pressure and so power expiration. The lung-thoracic wall system then returns to the resting or equilibrium position (known as functional residual capacity) at end-expiration. The source of the stored elastic energy that drives expiration is the elastic recoil of the lungs (not the elastic recoil of the thoracic wall) hence the correction I have made on the page.

Indeed, during inspiration as the thoracic wall moves outward, its elastic energy (elastic recoil) actually decreases as the resting position of the thoracic wall (alone) is even further out than its position at end-inspiration. Hence the elastic recoil of the thoracic wall cannot provide energy for expiration, and indeed its elastic recoil increases during expiration. Note that this means that the increased elastic recoil of the lungs at end-inspiration ends up doing two things: [1] it drives expiration, and [2] it transfers some of the lung's elastic recoil to the thoracic wall. Inspiration and expiration therefore involve some cycling of energy back and forth between the lungs and chest wall. KerryB (talk) —Preceding undated comment added 03:17, 3 November 2019 (UTC)

Biology
Excretion Excretion is a process in which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys, and skin.[1] This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. Excretion is an essential process in all forms of life. For example, in mammals, urine is expelled through the urethra, which is part of the excretory system. In unicellular organisms, waste products are discharged directly through the surface of the cell.

During life activities such as cellular respiration, several chemical reactions take place in the body. These are known as metabolism. These chemical reactions produce waste products such as carbon dioxide, water, salts, urea and uric acid. Accumulation of these wastes beyond a level inside the body is harmful to the body. The excretory organs remove these wastes. This process of removal of metabolic waste from the body is known as excretion.

Green plants produce carbon dioxide and water as respiratory products. In green plants, the carbon dioxide released during respiration gets used during photosynthesis. Oxygen is a by product generated during photosynthesis, and exits through stomata, root cell walls, and other routes. Plants can get rid of excess water by transpiration and guttation. It has been shown that the leaf acts as an 'excretophore' and, in addition to being a primary organ of photosynthesis, is also used as a method of excreting toxic wastes via diffusion. Other waste materials that are exuded by some plants — resin, saps, latex, etc. are forced from the interior of the plant by hydrostatic pressures inside the plant and by absorptive forces of plant cells. These latter processes do not need added energy, they act passively. However, during the pre-abscission phase, the metabolic levels of a leaf are high.[2][3] Plants also excrete some waste substances into the soil around them.[4] 2405:201:A40F:B854:185B:6BB0:89B:1ADD (talk) 13:37, 9 February 2023 (UTC)

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