Muscle Cells
Parts of a muscle
- Nucleus - holds the DNA information and controls the cells in the muscle.
- Mitochondria - processes nutrients and turns it into energy/fuel for the cell.
- Myofibril - threads of a muscle, which is found in an expanded muscle.
- Myosin - Allows the muscle to contract and move.
- Actin - A muscle protein which assists in the expanding and contracting of the muscle.
- Sarcoplasmic reticulum - releases calcium ions (electrical charges) during contraction and absorbs it during relaxation.
One of the muscle cell types are muscle tissue, which is one of the four tissue types. It helps to provide heat and allows movement by contracting the muscles. Muscle tissue has three categories: skeletal (bone) muscle, cardiac (heart) muscle and visceral muscle, these muscle categories have different cells in them which allows them to support different areas of the body.
Skeletal muscle:
This muscle can be found in different places of the body, as it is most common, it takes up about 40% of the total body mass. This muscle supports organs which can contract and expand such as the diaphragm, eyes and throat. Muscles which can be controlled consciously, using the cerebral part of your brain, are also part of the skeletal muscle group. Actions such as frowning, walking, pushing and many more actions are controlled.
Cardiac muscle:
As the name supposes, the cardiac muscle are only found around the heart. It plays a major role of pumping blood around the body, without us realising it, for an entire lifetime. The cardiac muscle pumps blood by contracting and expanding, which pushes the blood into the veins to carry oxygen to different parts of the body.
Visceral muscle:
Visceral muscles are found inside the organs to move different substances around, it is most commonly known as the smooth muscle. This muscle works without us knowing it, as it controls blood pressure (for cholesterol), helps us digest eaten substances and many more, the different substances in each part of the organ are sorted into different categories and moved all around the body.
Skeletal muscle:
This muscle can be found in different places of the body, as it is most common, it takes up about 40% of the total body mass. This muscle supports organs which can contract and expand such as the diaphragm, eyes and throat. Muscles which can be controlled consciously, using the cerebral part of your brain, are also part of the skeletal muscle group. Actions such as frowning, walking, pushing and many more actions are controlled.
Cardiac muscle:
As the name supposes, the cardiac muscle are only found around the heart. It plays a major role of pumping blood around the body, without us realising it, for an entire lifetime. The cardiac muscle pumps blood by contracting and expanding, which pushes the blood into the veins to carry oxygen to different parts of the body.
Visceral muscle:
Visceral muscles are found inside the organs to move different substances around, it is most commonly known as the smooth muscle. This muscle works without us knowing it, as it controls blood pressure (for cholesterol), helps us digest eaten substances and many more, the different substances in each part of the organ are sorted into different categories and moved all around the body.
Bibliography
Muscle sites
http://www.innerbody.com/image/musc01.html
http://www.ucl.ac.uk/~sjjgsca/MuscleCardiac.html
Image
http://www.aqua4balance.com/wp-content/uploads/2013/10/contraction.gif
http://fsweb.bainbridge.edu/acunningham/AP/AP-img/TissueSlide-MuscleCardiac-01.jpg
http://gamification.commons.hwdsb.on.ca/files/2013/10/image1.jpg
Muscle sites
http://www.innerbody.com/image/musc01.html
http://www.ucl.ac.uk/~sjjgsca/MuscleCardiac.html
Image
http://www.aqua4balance.com/wp-content/uploads/2013/10/contraction.gif
http://fsweb.bainbridge.edu/acunningham/AP/AP-img/TissueSlide-MuscleCardiac-01.jpg
http://gamification.commons.hwdsb.on.ca/files/2013/10/image1.jpg