The nuclear membrane has a similar structure to the cell membrane but it contains gaps which allow protein to pass through. The nucleus controls almost all of the activities of the cell. Cytoplasm: The cytoplasm refers to anything which is inside the cell boundary and outside the nucleus. It is a semi-fluid material which is capable of flowing slowly. Many chemical reactions are carried out in the cytoplasm.
Multicellular Organisms: Are organisms consisting of more than one cell, compared to unicellulars. A cell needs to send messages, identify, and attach to other cells. A multicellular however,
Cardiovascular system has three main functions: Transport of nutrients, oxygen and hormones to cells throughout our body and removal of metabolic wastes such as (carbon dioxide and nitrogenous wastes). Protections of the human body by while blood cells, antibodies and complement proteins that circulate in the blood and defend our body against foreign microbes and toxic. Clotting mechanisms are also present that protect the human body from blood loss after injuries. Regulation of body temperature, fluid pH and water content of
Examples of molecules are: Hydrogen, Oxygen. Organelle: Made of molecules and are the small organs in each cell. Examples in animal cells are: Nucleus, Ribosome, Lysosome. Cell: Made up of organelles. Cells are the building blocks of life.
Outline the functions of the main cell components: Cell membrane (also known as plasma membrane) - Plasma membrane is the outer membrane of a cell, which is made up of two layers. It is a thin semi permeable membrane layer, which surrounds the cytoplasm and other parts of the cell. Golgi apparatus-Quick look: Golgi apparatus(or complex, or body, or ‘the ‘Golgi’) is found in all plant and animal cells and is the term given to groups of flattened disc-like structures located close to the endoplasmic reticulum. The number of ‘Golgi apparatus’ within a cell is variable. Animal cells tend to have fewer and larger Golgi apparatus.
| | | D) | All living organisms are composed of one or more cells. | | | | | | Feedback: Cell theory states: all living things are made of cells; cells basic units of structure and organization; cells arise only from previously existing cells. Most prokaryotic cells do not have specialized internal structures. | | 2 CORRECT | | A ____ contains polar and nonpolar ends, forming the plasma membrane. | | | A) | microtubule | | | B) | transport protein | |
The food and drink goes into our stomach and from there it is digested, absorbed, then either stored or converted into energy by chemical reactions in our body, therefore food is chemical energy. https://uk.answers.yahoo.com/question Glucose + Oxygen = Carbon Dioxide + Water + Energy In other words, glucose and oxygen are turned into carbon dioxide and water releasing energy. http://purchon.com/chemistry/?page_id=223 The sum of all chemical reactions within a living organism is known as metabolism. The two body systems I am going to explain in detail are Respiratory and Circulatory and their role in producing energy: Respiration Respiration involves breathing. External respiration which is also known as breathing refers to the inhalation of oxygen from the air into the lungs and expelling carbon dioxide from the lungs to the air.
Plasma carries food from the stomach to cells but carries waste from the cells to the kidneys and intestine. The body needs lots of haemoglobin because it will combine with the gases; oxygen and carbon dioxide. The red cells carry the oxygen in the arteries and capillaries to cells of the body. One function of the blood is to transport materials within plasma and hemoglobin around the body. Plasma contains hormones, nutrients and waste substances.
Epithelial tissues line the cavities and surfaces of structures throughout the body, and also form many glands. Functions of epithelial cells include secretion, selective absorption, protection, cellular transport and detection of sensation. Epithelial layers are avascular, meaning they contain no blood vessels and rely on underlying vascular tissues to absorb nutrients from. Epithelia can also be organized into clusters of cells that function as exocrine and endocrine glands. Exocrine and endocrine epithelial cells are highly vascular.
Describe the characteristics of epithelial tissue. (5 points) Epithelial tissue has many characteristics. It is composed primarily of closely packed cells with little extracellular material between. The cells fit close together to form continuous sheets. The cells are held together by lateral contacts.