• 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)

    The surface tension of the thin film moisture does not allow the two layers to pull apart but does allow them to slide. This means that when the chest wall moves in breathing, the lungs move with it. Each bronchus after repeatedly diving ends in a group of single-layered globe-shaped

  2. P2 - Physiology of fluid balance

    A liquid is another state of matter and differs from a solid in several ways. Firstly, the atoms within a liquid are not packed as tightly compared to a solid and as a result of the atoms being able to move more freely, liquids are able to flow.

  1. P1 & P2 Public Health

    The purpose and vision of this NHS Plan is to give the people of Britain a health service fit for the 21st century: a health service designed around the patient.' http://www.dh.gov.uk/prod_consum_dh/groups/dh_digitalassets/@dh/@en/documents/digitalasset/dh_4055863.pdf In 2003; Tackling Health Inequalities: a programme for action (2003) was produced focusing primarily on smoking and teenage pregnancies.

  2. Describe the role of energy in the body and the physiology of three named ...

    In order to work out the cardiac output the amount of blood that is released from the left ventricle in one beat and also the number of beats that occur within a minute. The number of beats that occur within a minute is known as heart rate and the amount

  1. Child development - patterns of development. To increase my awareness and knowledge of ...

    In this task I am going to analyse Marie's weight and height through her four stages of development. I will provide the information in tables along with the general norms expected of a child at the certain ages. I am then going to explain each table comparing and remarking if Marie has met the general norm or not.

  2. Describe the distribution of water in the body and the function of constituents of ...

    Molecules are always moving around, when they balance out the concentration gradient the molecule do not stop moving, they keep moving but there is no net movement, therefore they reach a stage of equilibrium. Role of water in relation to properties *Specific heat capacity: the specific heat capacity is where

  1. Outline current legislation, guidelines policies and procedure within own UK Home Nation affecting the ...

    ? Racist racial taunts, graffiti, gestures ? Sexual unwanted physical contact or sexually abusive comments ? Homophobic because of, or focussing on the issue of sexuality ? Verbal name-calling, sarcasm, spreading rumours, teasing ? Cyber All areas of internet ,such as email & internet chat room misuse Mobile threats by text messaging & calls Misuse of associated technology , i.e.

  2. Unit 5 Anatomy and physiology in health and social care

    Some cells have more than one nucleolus. It is represented by the plum pit. Ribosome - small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis. They are represented by candy sprinkles. Rough endoplasmic reticulum - (rough ER)

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