Cells & Tissues Lect 4: Muscle Tissue Features

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What is the primary component of thin filaments in myofibrils?

Titan

Actin (correct)

Myosin

Troponin

Which part of the myofibril contains all the thick filaments made of myosin?

Z Disc

I Band

Sarcomere

A Band (correct)

What is the primary component of thick filaments in myofibrils?

Myosin (correct)

Tropomyosin

Actin

Nebulin

Which compartment of myofilaments is bounded by Z discs?

Sarcomere Signup and view all the answers

What is the function of sarcomeres in a myofibril?

To organize thin and thick filaments Signup and view all the answers

Which region of the myofibril contains only thin filaments primarily composed of actin?

I Band Signup and view all the answers

What is the primary purpose of muscle tissue?

Producing body movements Signup and view all the answers

Which type of muscle tissue is considered voluntary?

Skeletal muscle Signup and view all the answers

Why are skeletal muscle fibres striated?

Due to the highly organized arrangements of myofibrils Signup and view all the answers

Which muscle is responsible for allowing us to look at the bottom of our foot?

Sartorius Signup and view all the answers

What type of muscle tissue is found attached to bones by tendons?

Skeletal muscle Signup and view all the answers

What is the type of contraction generated by muscle tissue when using energy from ATP?

'Contraction' Signup and view all the answers

What is the function of gap junctions within intercalated discs in cardiac muscle tissue?

Facilitate rapid electrical communication between neighboring cells Signup and view all the answers

Where are Purkinje fibers primarily located in the heart?

Ventricles (lower chambers of the heart) Signup and view all the answers

What is the main role of desmosomes in intercalated discs?

Provide adhesion between adjacent cells during contraction Signup and view all the answers

How are Purkinje fibers described in terms of their function?

Electrical conductors Signup and view all the answers

Which type of tissue makes up Purkinje fibers?

Specialized muscle cells Signup and view all the answers

What is the primary function of Purkinje fibers in cardiac muscle?

Conduct electrical signals Signup and view all the answers

What is the core of sarcomere shortening?

Interaction between actin and myosin proteins Signup and view all the answers

What happens to the I band and H zone during muscle contraction?

They narrow and eventually disappear Signup and view all the answers

Where are the myosin heads attached during filament sliding?

To the thin filaments Signup and view all the answers

What remains relatively constant in length during muscle contraction?

A band Signup and view all the answers

What leads to the shortening of the entire muscle fibre?

Sliding of sarcomeres Signup and view all the answers

How do Z discs change position during muscle contraction?

They come closer together Signup and view all the answers

Where are bipolar neurons commonly found?

Retina of the eyes Signup and view all the answers

What is the main function of bipolar neurons?

Relaying sensory information Signup and view all the answers

What is a key characteristic of unipolar neurons?

They act as sensory specialists Signup and view all the answers

How do unipolar neurons differ from bipolar neurons in terms of structure?

Unipolar neurons have a continuous dendritic and axon cable Signup and view all the answers

Which part of a neuron coordinates its activities?

Cell body (soma) Signup and view all the answers

What differentiates unipolar neurons from bipolar neurons in terms of their length?

Bipolar neurons are long-distance runners Signup and view all the answers