Muscle Contraction

Organelle that releases calcium for contraction

• mitochondria

• sarcoplasmic reticulum

• neurotransmitter

• T tubule

Carry message to contract into the muscle fiber

• sarcoplasmic reticulum

• myofibril

• T tubules

• synaptic cleft

helps to open up active sites on actin

• calcium

• acetylcholine

• synaptic cleft

• neurotransmitter

the neurotransmitter that stimulates muscle cells

• calcium

• ATP

• acetylcholine

• calcium

space between a neuron and a muscle fiber

• neuromuscular junction

• synaptic cleft

• acetylcholine

• t tubules

breaks the attachment between actin and myosin

• calcium

• acetylcholine

• ATP

• t tubules

where a neuron and a muscle fiber meet

• neuromuscular junction

• t tubules

• sarcolemma

• neurotransmitter

what come first?

• calcium released

• acetylcholine released

What comes first?

• calcium opens up active site

• myosin pivots and pulls

What comes first?

• t tubules bring signal into fiber

• acetylcholine crosses the synaptic cleft