Muscular system

What are the three types of muscle tissue?

The three types of muscle tissue are skeletal muscle, smooth muscle, and cardiac muscle.

What is the main characteristic of skeletal muscle cells?

Skeletal muscle cells have striations and are long thread-like muscle fibers.

What type of contraction do smooth muscles have?

Involuntary contraction.

Where is cardiac muscle located?

Only found in the heart.

What connects muscle fibers to bones?

Tendons.

What is a key function of skeletal muscle?

Supports voluntary movements such as moving the head, trunk, and limbs.

What is the role of the sarcolemma in muscle cells?

It receives and conducts stimuli from adjacent nerves.

What is the difference between the sarcolemma and the sarcoplasmic reticulum?

The sarcolemma is the cell membrane, while the sarcoplasmic reticulum stores calcium ions for muscle contraction.

What is the RICE method used for in muscle injuries?

Rest, Ice, Compression, and Elevation to heal muscle tears and strains.

What does muscular dystrophy lead to?

It causes muscle cell death and atrophy.

How does smooth muscle contribute to bodily functions?

It aids in moving blood, fluids, and nutrients through the organ systems.

What is the function of intercalated disks in cardiac muscle?

They link cardiac cells together to allow for synchronized heartbeats.

What happens to muscles when they are overused?

They can become damaged or inflamed, causing injuries or strains.

How do skeletal muscles enable movement?

Through the contraction and relaxation of muscle fibers attached to bones.

What are fascicles in muscles?

Bundles of muscle fibers.

What type of connective tissue surrounds the entire muscle?

Epimysium.

What is tendinitis?

Inflammation of a tendon due to repeated strain without adequate healing.

How are skeletal muscles characterized histologically?

They appear striated with closely packed, elongated fibers.

How are smooth muscles different structurally from skeletal muscles?

Smooth muscles are shorter, do not have striations, and usually have just one nucleus.

What is the purpose of blood vessels in skeletal muscles?

To provide an abundant supply of blood to help with muscle contraction.

What occurs at the origin point of a muscle?

It is the attachment point that remains stationary during muscle contraction.

What is the primary role of tendons?

To connect muscles to bones.

What is the significance of myofibrils in muscle contraction?

They contain thick and thin filaments that enable contraction through sliding mechanisms.

What is a common result of muscle inactivity?

Muscle atrophy or weakening.