Unit 1, Assignment 2,
D2
, • There are 3 types of muscular tissue that every individual has in the human body:
• Skeletal
• Cardiac
• Smooth
All of these types of muscular tissue, play a vital role providing movement and heat generation to the organs of the body. Alth
each type controls a different sort of movement within the body, therefore they are structured slightly in a different way to fit
their function.
Skeletal muscle tissue is the only muscle tissue under the direct control of the cerebral cortex of the brain, giving it the desig
of being voluntary muscle. All conscious movements of the body, including movement of the limbs, eye movements, facial
expressions are all products of skeletal muscle tissue. The contraction of skeletal muscles also produces the bulk of the body’
as a by product of cellular metabolism. Skeletal muscle is made up of thousands of muscle fibres that run the length of the
muscle. Each muscle fibre consists of many contractile units called myofibrils which run the length of each muscle fibre. Myo
are responsible for the skeletal muscles great strength and ability to pull with incredible force and propel the body. Skeletal m
tissue is connected to the bones through the tendons. Its cells contain multiple nuclei to produce enough protein for the cells
substantial size and a persons physical demands.
Cardiac muscle is a specialized tissue that is found only in the heart. Cardiac muscle is considered to be an involuntary tissue
because it is controlled unconsciously by regions of the brain stem and hypothalamus. It has characteristics similar to both sm
and skeletal muscle tissue, as well as particular assets, that allow it to function with fast but sustained contractions, rapid
conduction and coordinated movement. Skeletal, smooth and cardiac muscle all contract when a rise in calcium inside the mu
cell allows interaction between actun and myosin. Another commonality between skeletal and cardiac muscle is the presence
striations due to the arrangement of actin and myosin into regular myofibrils. The presence of myofibrils and many mitochond
cardiac muscle cells provides them with great strength and endurance to pump blood throughout an entire lifetime. However,
cardiac muscle has a unique structure and differs in the way that contraction is initiated and regulated. Cardiac muscle tissue
involved in propelling blood from the heart through to the arteries. It is specially adapted to resist fatigue, so that the heart c
beat continuously; therefore its cells have a large number of mitochondria to produce energy. It is involuntarily controlled and
therefore we do not have to control the heartbeat consciously. The cells of cardiac muscle tissue are shorter than skeletal mu
tissue and form a network of many branches between the cells. Intercalated disks of overlapping cell membrane form betwee
cardiac muscle cells to lock them together tightly and allow the quick passage of electrochemical signals between cells. The c
do not fuse during development, leaving each cell with a single nucleus.
D2
, • There are 3 types of muscular tissue that every individual has in the human body:
• Skeletal
• Cardiac
• Smooth
All of these types of muscular tissue, play a vital role providing movement and heat generation to the organs of the body. Alth
each type controls a different sort of movement within the body, therefore they are structured slightly in a different way to fit
their function.
Skeletal muscle tissue is the only muscle tissue under the direct control of the cerebral cortex of the brain, giving it the desig
of being voluntary muscle. All conscious movements of the body, including movement of the limbs, eye movements, facial
expressions are all products of skeletal muscle tissue. The contraction of skeletal muscles also produces the bulk of the body’
as a by product of cellular metabolism. Skeletal muscle is made up of thousands of muscle fibres that run the length of the
muscle. Each muscle fibre consists of many contractile units called myofibrils which run the length of each muscle fibre. Myo
are responsible for the skeletal muscles great strength and ability to pull with incredible force and propel the body. Skeletal m
tissue is connected to the bones through the tendons. Its cells contain multiple nuclei to produce enough protein for the cells
substantial size and a persons physical demands.
Cardiac muscle is a specialized tissue that is found only in the heart. Cardiac muscle is considered to be an involuntary tissue
because it is controlled unconsciously by regions of the brain stem and hypothalamus. It has characteristics similar to both sm
and skeletal muscle tissue, as well as particular assets, that allow it to function with fast but sustained contractions, rapid
conduction and coordinated movement. Skeletal, smooth and cardiac muscle all contract when a rise in calcium inside the mu
cell allows interaction between actun and myosin. Another commonality between skeletal and cardiac muscle is the presence
striations due to the arrangement of actin and myosin into regular myofibrils. The presence of myofibrils and many mitochond
cardiac muscle cells provides them with great strength and endurance to pump blood throughout an entire lifetime. However,
cardiac muscle has a unique structure and differs in the way that contraction is initiated and regulated. Cardiac muscle tissue
involved in propelling blood from the heart through to the arteries. It is specially adapted to resist fatigue, so that the heart c
beat continuously; therefore its cells have a large number of mitochondria to produce energy. It is involuntarily controlled and
therefore we do not have to control the heartbeat consciously. The cells of cardiac muscle tissue are shorter than skeletal mu
tissue and form a network of many branches between the cells. Intercalated disks of overlapping cell membrane form betwee
cardiac muscle cells to lock them together tightly and allow the quick passage of electrochemical signals between cells. The c
do not fuse during development, leaving each cell with a single nucleus.
