Which of the following is NOT a function of the muscular system?
5 Functions of Muscular
There are over 600 muscles in the body, accounting for nearly half of the body weight.
Consider the action of picking up a pen that has dropped onto the floor. This seemingly simple action of retrieving the pen involves the coordinated action of several muscles pulling on bones at joints to create movement. Muscles are also involved in the movement of body fluids such as blood, lymph and urine. Consider also the beating of the heart which is continuous throughout life.
- Maintaining posture
Some fibres in a muscle resist movement and create slight tension in order to enable us to stand upright. This is essential since without body posture we would be unable to maintain normal body positions such as sitting down or standing up.
- The production of heat
As muscles create movement in the body they generate heat as a by-product which helps to maintain our normal body temperature.
- production of heat
- exchange of gases
- maintenance of posture
Match the 5 muscle functions
Coveragefor the skeleton
Maintain posture andbody shape
Help to maintainbody temperature
A voluntary muscle will only contract if a stimulus is applied to it via?
Voluntary & Involuntary Muscles
- Involuntary muscles is not under the control of the conscious part of the brain. It is found in the walls of hollow organs such as the stomach, intestines, bladder, uterus, blood vessels and heart.
- Voluntary muscle tissue is made up of bands of elastic or contractile tissue bound together in bundles and enclosed by a connective tissue sheath which protects the muscle and helps to give it a contoured shape. Voluntary muscle works intimately with the nervous system and will, therefore, only contract if a stimulus is applied to it via a motor nerve. Each muscle fibre receives its own nerve impulse so that fine and varied motions are possible. Voluntary muscles also have their own small stored supply of glycogen which is used as fuel for energy. Voluntary muscle tissue differs from other types of muscle tissue in that the muscles tire easily and need regular exercise.
- sensory nerve
- mixed nerve
- motor nerve
- association nerve
Where would you NOT find involuntary muscle tissue?
The smooth muscle can be found in which part of the body?
3 Types of Muscle Tissue
Striped appearance. Have many nuclei. Held together by connective tissue. Voluntary or skeletal muscle tissue consists of muscle fibres held together by fibrous connective tissue and penetrated by numerous tiny blood vessels and nerves.
Each skeletal muscle fibre is made up of thin fibres called myofibrils which are made up of two different types of protein strands called actin and myosin.
This gives skeletal muscle its striated or striped appearance. Muscle fibre contraction results from a sliding movement within the myofibrils in which actin and myosin filaments merge.
Striped appearance. Branched structure. Has a single nucleus.
Has intercalated discs in between each cardiac muscle cell.
It is found only in the heart and like skeletal muscle it is striated. However, it is branched in structure and has intercalated discs in between each muscle cell.
Shaped like spindles. Has a single nucleus.
Contracts or relaxes in response to nerve impulses, stretching or hormones.
Muscle tissue makes up about 50 per cent of your total body weight and is composed of:
- 20 per cent protein
- 75 per cent water
- 5 per cent mineral salts, glycogen and fat.
What is Joint?
Joints are the point at which two or more bones articulate (meet)
The impetus for any movement is derived from the contraction of a muscle. However muscles rarely connect directly to the bones – most muscles are connected to the bones by tendons.
Tendons are comprised of strong, almost inelastic white fibrous connective tissue and vary in length and thickness. When a muscle contracts it pulls on its tendon. The tendon then pulls on the bone to which it is attached to cause the bone to move at the joint.
Ligaments join bone to bone to strengthen, support and protect joints. They hold the bones together to prevent dislocation but stretch slightly to allow movement. Ligaments are thicker at the joints that require the most strength and support (e.g. the hip) but are thinner and less abundant in joints that require a lot of movement (e.g. the shoulder).
What’s the name of fibrous connective tissue surrounding whole muscles?
- Holds the muscle together and segregates one muscle from another, allowing their free movement.
- Carries nerves, blood vessels and lymphatic vessels, and fills the space between the muscles.
Fill in the blank
Fascia is fibrous tissue surrounding whole muscles.