Muscle Tissue

Identify the Skeletal Muscle (control, Nuclei, Apearance, shape, location, functions)

• Voluntary

• Nuclei: More than one nucleus (one long cell)

• Appearance: Striped

• Shape: Long, sylindrical fibers 

• Location: Attached to bones via tendons 

• Functions: Movement, posture, heat production

Identify Cardiac Muscle (Control, Appearance, Nuclei, Special features, location, functions)

• Involuntary 

• Striated, branched fibers

• 1-2 centrally located nuclei per cell 

• Special features 

  • Intercalated discs (contain gap junctions) 

  • They help cardiac muscles stick together, and communicate quickly with each other so the heart can beat.

• Heart only

• Pumping blood 

Identify Smooth Muscle (control, appearence, Nuclei, shape, location, function)

• Involuntary

• Non-striated (smooth)

• One central nucleus per cell

• Spindle-shaped (tappered ends)

• Walls of hollaw organs (e.g., intestines, blood vessels, bladder)

• Move substances through body (digestion, blood flow) 

What is Muscle Tissue? and what is it made of?

It specializes in contraction and movement. It’s made out of cells called muscle fibers that can shorten to produce force. 

myo/ mys

Muscle (myocardium =heart muscle)

sarco

flesh or muscle (sarcomere = functional unit of muscle fiber)

tendin

tendon (connects muscle to bone)

Muscle Fiber

Individual muscle cell

Myofibril 

small strands inside fiber, made of sarcomeres

Sarcomere

functional unit of contraction

Tendon

connective tissue attaching muscle to bone

Fascicle

bundle of muscle fibers

What are the functions of Muscle Tissue?

1. Movement of body parts (Skeletal)

2. Pumping blood (cardiac)

3. Moving substances through organs (smooth)

4. Maintaning posture and body postion

5. Heat production 

What are the three types of muscle tissue? How are they different in strutcure and control?

• Skeletal: Striated, long cylindical fibers, more than one nuclei; Voluntary control.

• Cardiac: striated, branched fiers with interalated discs, usally one nucleus per cell; involuntary control. 

• Smooth: Non-striated, spindle-shaped fibers, single nucleus, ; involuntary control

Where is each type of muscle tissue located in the body?

Skeletal muscle: Attached to bones

Cardiac Muscle: Heart walls (myocardium)

Smooth Muscle: Walls of hallow organs like the stomach, intestines, blood vessels, bladder. 

What is a sarcomere, and why is it important?

• A sacromere is the smallest functional unit of a muscle fiber that contracts.

• It alllowd the muscle to shorten and create force. 

How does skeletal muscle differ from smooth muscle in appearance and function?

• Appearance: Skeletal= striated ; Smooth = non-striated 

• Function: Skeletal =moves bones voluntary; Smooth =moves substances through organs involuntarily. 

How does cardiac muscle connect to ensure synchronized contraction?

• Cardiac muscle cells are connected by intercalated discs, which allow electrical impulses to pass quickly from cell to cell, ensuring the heart contracts as a unit.

Why is smooth muscle important in organs like the intestines and blood vessels?

• It helps move substances (food, blood, urine) through organs and regulates flow without conscious control.

Which type of muscle tissue are voluntary, and which are involuntary?

• Voluntary: Skeletal muscle

• Involuntary: Cardiac and smooth muscle

How do tendons and fascicles relate to muscle structure and movement?

• Tendons: attach muscles to bones so contraction can move the skeleton. 

• Fascicles are bundles of muscle fibers that make the muscle strong and efficient in contracting.