IB Biology: C3.1-Outputs from the Brain to Muscles

Front

What processes information from sensory neurons and makes decisions about movement?

Back

The cerebral hemispheres.

Front

What sends signals to motor neurons for locomotion and posture control?

Back

The primary motor cortex in the frontal lobe of the cerebrum.

Front

How are striated muscles controlled?

Back

They can be controlled consciously via signals from the primary motor cortex.

Front

What happens at the neuromuscular junction?

Back

Each axon of a motor neuron forms synapses with multiple striated muscle fibres.

Front

What is released when action potential reaches the neuromuscular junction?

Back

The neurotransmitter acetylcholine.

Front

What does acetylcholine do in muscle contraction?

Back

It initiates contractions of the sarcomeres, leading to muscle shortening and bone movement.

Front

How are striated muscles stimulated to contract?

Back

By signals from motor neurons.