• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Produce a written assignment showing an understanding of the four main tissue types (epithelial, muscle, connective and nervous) and what they do in the heart and the intestine.

Extracts from this document...

Introduction

Unit 5- Anatomy and physiology Task 1 P2- Outline the structure of the main tissues of the body. Produce a written assignment showing an understanding of the four main tissue types (epithelial, muscle, connective and nervous) and what they do in the heart and the intestine. Tissues are groups of cells with a common structure and function. There are four main tissues in the body - epithelium, muscle, connective tissue and nervous tissue. Epithelial tissue- Epithelial tissue covers external surfaces and internal cavities and organs. Glands are also composed of epithelial tissue. It is made up of cells closely packed and ranged in one or more layers; compound epithelia is made up of several layers of cells and Simple epithelia is a single layer of cells. Simple epithelial includes four different types; squamous, cuboidal, ciliated and columnar. Epithelial tissue, regardless of the type, is usually separated from the underlying tissue by a thin sheet of connective tissue; basement membrane. The basement membrane provides structural support for the epithelium and also binds it to neighbouring structures. As a group, epithelial tissues perform a variety of functions, including protection, absorption, excretion, secretion and lubrication. It is surface tissue so capacity for growth and repair is greater than any other tissue. In the Intestines- The apical surface of epithelial cells may have tiny projections called microvilli. ...read more.

Middle

Going from inside the lumen radially outwards, one passes the mucosa (glandular epithelium and muscularis mucosa), submucosa, muscularis externa (made up of inner circular and outer longitudinal), and lastly serosa. Serosa is made up of loose connective tissue and coated in mucus to prevent friction damage from the intestine rubbing against other tissue. Holding all this in place are the mesenteries which suspend the intestine in the abdominal cavity and stop it being disturbed when a person is physically active. In the heart- Connective tissue provides the final pathway for diffusion of nutrients, oxygen, waste and metabolites to and from the cells of the body. All blood vessels are embedded in connective tissue. The only cells which receive their sustenance directly from the blood are the endothelial cells lining the vessels themselves. All other cells are supplied via diffusion through intermediary connective tissue. The transport functions of blood and connective tissue cannot be separated. The heart and circulatory system simply facilitate the movement of this travelling tissue. The valves in the heart are also made from connective tissues, they control the amount of blood that is passed through the heart and into the blood stream, and it also helps to reduce the flow back to the heart. Nervous tissue- Nervous tissue is found only in the nervous system and consists of nerves, brain and spinal column. ...read more.

Conclusion

Non-striated muscle tissue is not connected to the bones. It is controlled involuntary, as it includes the organs that operate without conscious thought, although it still requires stimulation from the nervous system. Cardiac muscles are only found in the heart. They are self-contracting, autonomically regulated and continue to contract in rhythmic fashion for the whole life of the organism. Some of the cardiac muscle cells contract without any nervous stimulation. In the heart- Cardiac muscle does have several unique features. Present in cardiac muscle are intercalated discs, which are connections between two adjacent cardiac cells. Intercalated discs help multiple cardiac muscle cells contract rapidly as a unit. This is important for the heart to function properly. Cardiac muscle also can contract more powerfully when it is stretched slightly. When the ventricles are filled, they are stretched beyond their normal resting capacity. The result is a more powerful contraction, ensuring that the maximum amount of blood can be forced from the ventricles and into the arteries with each stroke. This is most noticeable during exercise, when the heart beats rapidly. This pumps blood around to all the cells in the body, helps to retrieve it and re-oxygenate it and pump it back around. In the intestine- Smooth muscle is found in the walls of hollow organs like your intestines and stomach. The muscular walls of the intestines contract to push food through your body and help to break it up, this is an involuntary function. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Healthcare section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

4 star(s)

This is a very good essay. It discusses tissue types and is generally correct and detailed throughout. There are a few areas that could be corrected through a little more research.

It would be greatly enhanced by including some diagrams.
****

Marked by teacher Sam Morran 26/06/2013

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Healthcare essays

  1. Marked by a teacher

    The Role of Energy in the Body and the Physiology of Three Named Body ...

    5 star(s)

    This arrangement produces a large surface area over which incoming air flows. During the through the nose, the air is warmed and moistened by the close contact with the mucous membrane and filtered by the ciliated cells.

  2. Effective communication - P1, P2, P3, M1

    This may be helpful so that there is not any confusion. Another disadvantage towards using interpreter is that if a service user speaks a different language to the care worker and they are from another culture, then they may

  1. P1 & P2 Public Health

    The above screening methods can be used to treat and detect illness/disease. * Control communicable disease Controlling communicable diseases is an important aspect in public health strategies within the UK. 'Key aspects of this involve planning to include screening and early detection, isolation and treatment, containment, prevention and cure eradication where possible.'

  2. This essay is compose of four domains. The four domains I will be reflecting ...

    (NMC (2002). Example, a nurse must not do anything to destroy the trust of the public in the NHS. The duty of a nurse is to promotes, advocates and mak e every effort to protect the health, safety, and rights of the patient receiving care.

  1. Types of communication including factors that support and inhibit communication within a care setting ...

    The client appreciates this information being on the schools website as it stopped the pupil from having to get ready and walk down to the primary school to find it being shut. Special Methods of Communication If a person is deaf or blind or even both this may cause a

  2. Dementia - research report for P1 and P2.

    Additionally an individual with MCI are still able to get dressed but may forget things that have happened the week before like watching a film. Diagnoses of dementia There are many people who have dementia that will never be diagnosed, there is a hope for change to this by the National Dementia strategy.

  1. Health and Social Care Unit 3 Health and Well being

    poor health, but however does demonstrate how several factors will affect an individualâs health, taking into account such things as lifestyle choices and environmental factors.. The social model of health will recognise that ill health issues could be addressed to by resolving social issues, such as damp accommodation potentially causing bronchitis and repeated chest infections for an older person.

  2. Unit 5 P3: Outline the gross structure of all main body systems

    food as faeces until it is passed out of the body through the anus. The Pancreas: Produces some of the hormones that control glucose levels in the blood to secrete enzymes into the small intestine that help the body to break down and digest food The Kidneys: Are located at

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work