Second part[ edit ] The second part, or descending part, of the duodenum begins at the superior duodenal flexure. It goes inferior to the lower border of vertebral body L3, before making a sharp turn medially into the inferior duodenal flexure, the end of the descending part.
A blog that can help with essays regarding some health and social or Health science topics. Explain Anatomy d2 concept of homeostasis P5 Discuss the probable homeostatic responses to changes in the internal environment during exercise M2 Homeostasis can be defined as the maintenance of a constant internal environment within the body.
Sensors within our body monitor a number of things including breathing, heart rate, body temperature and also blood sugar levels. These can also be known as detectors, which send signals to the control centre when there is a change, or the value has deviated from the norm.
This value will then be corrected so that the norm can be maintained study.
Negative feedback is important in homeostasis and it responds when certain conditions change. This therefore means that receptors and effectors, i.
This may also be explained by saying that a change in variable is detected by the receptor and the information from this is sent along an afferent pathway to the control centre. The control centre then sends the information along an efferent pathway to the effector whereby it either opposes or enhances the stimulus Bioserv, In the medulla oblongata there are chemoreceptors which are adjacent to the respiratory centre.
These chemoreceptors are sensitive to the changes of arterial PCO2, PO2 and also pH, and send information to the medulla, determining the nervous response depending on the changes of the variables Bioserv, Nerve impulses are therefore then sent to the repiratory muscles controlling both the force and how often it contracts.
Furthermore, this changes the rate and depth of breathing and also ventilation UWE, The change in ventilation brings CO2, O2 and pH back to their norm.
Nerve impulses are sent along the phrenic nerve towards the external intercostal muscles which stimulates muscle contraction for inspiration. Expiration occurs due to the elastic recoil of the lungs and chest wall.
This nerve firing is what gives us our resting breathing rate of breaths per minute. During exercise, the muscles have to metabolise faster as they require both more oxygen and nutrients.
Due to this, the heart then pumps the blood harder and faster to keep up this demand, as the heart is doing more work to supply this blood.
This means that more oxygen is required, meaning, the response given is breathing being increased so that oxygen is pumped to all cells quicker. Due to homeostasis, levels of oxygen in the blood are always being measured, ensuring oxygen, carbon dioxide and also pH levels return to their norm.
Messages that are sent to the effectors informing them that the breathing rate has to be increased, however, will decrease again when all activity has been stopped. Homeostasis also controls heart rate. The medulla which is located within the brain also controls heart rate. When we are carrying out exercise the heart has to supply oxygenated blood to the rest of the body.
There is information sent to the medulla from the muscles via the nervous system. This allows the release of chemicals, to travel to the sinus node. The sinus node then therefore stimulates the contractions of the heart, also increasing the force which in turn, increases heart rate.
When you are at rest, or stop exercising, another message is sent to the medulla, which in turn releases acetylcholine, slowing the heart rate. When engaging in more intense exercise, epinephrine and norepinephrine is released, increasing heart rate to supply more oxygen to the body.The duodenum is the first part of the small intestine and is the continuation of the stomach.
Gross anatomy The duodenum is a cm C-shaped hollow viscus predominantly on the right hand side of the vertebral column. It lies at the level of. 3rd Dorsal: A, Just above middle of spine Of C7; B, lower border of spine of D2.
4th Dorsal: A, Just below upper border of spine of D1; B, junction of upper 1/3 and lower 2/3 of spine of D3 5th Dorsal: A, Upper border of spine of D2; B, junction of upper 1/4 and lower 3/4 of spine of D4.
Below is an essay on "D2 Unit 5 Anatomy and Physiology" from Anti Essays, your source for research papers, essays, and term paper examples. This assignment will evaluate the importance of homeostasis in maintaining a healthy functioning of the body.
Unit 5 Anatomy And Physiology D2 Evaluate The Importance Of Homeostasis In Maintaining The Healthy Functioning Of The Body. Homeostasis is a simple term which holds a large significance in the functionality of the human body.
This essay will discuss and define this term. MSU expects that you will respect the rights of faculty and other students as you participate in the educational process. Participating in an Desire2Learn course means that you may have access to personal information and academic work produced by other students and faculty members, such as discussion board postings, drafts of papers and other work produced in the course.
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