HBS Activity 1.2.1 - Sliding Filament Theory

Muscles are attached to bones by _____.

• Ligaments
• Tendons
• Cartilage
• Axons

The contractile unit of a muscle:

• sarcomere

• motor unit

• fascicle

• myofibril

Thick filaments within a myofibril are:

• ATPase

• Sarcoplasmic reticulum

• Actin

• Myosin

Thin filaments in a myofibril are

• Sarcomeres

• Sarcoplasm

• Actin

• Myosin

The energy needed to perform a muscle contraction comes directly from

• ATP

• Oxygen

• Glucose

• Calcium

The neurotransmitter stored in the axon terminal identified as #3

• Calcium Ion (Ca²⁺)

• Protein Channel

• Acetylcholine (Ach)

• Synaptic Cleft

The gap between a neuron and a muscle cell: (#4 in the diagram)

• synaptic cleft of Neuro-muscular junction (synapse)

• sarcolemma
• vesicle
• Ca²⁺ ion

The plasma membrane of a skeletal muscle cell is called the:

• sarcomere
• myofilament
• sarcolemma
• sarcoplasm

The neuron that transmits an impulse from the central nervous system to the muscle is called a:

• sensory neuron

• motor neuron

Do the lengths of the thick and thin filaments change during contraction?

• Yes

• No