Ultrastructure of Striated Muscle Striated muscle makes up the muscles in the body that are attached to the skeleton Striated muscle is made up of muscle fibres A muscle fibre is a highly specialis...
Stimulating Contraction in Striated Muscle Striated muscle contracts when it receives an impulse from a motor neurone via the neuromuscular junction When an impulse travelling along the axon of a m...
Cholinergic Synapses Where two neurones meet, they do not actually come into physical contact with each other – a very small gap, known as the synaptic cleft, separates them The ends of the two neu...
The Refractory Period Very shortly (about 1 ms) after an action potential has been generated in a section of the axon membrane, all the sodium ion voltage-gated channel proteins in this section clo...
Speed of Conduction of Impulses The speed of conduction of an impulse refers to how quickly the impulse is transmitted along a neurone It is determined by two main factors: the presence or absence ...
Transmission of Nerve Impulses Neurones transmit electrical impulses, which travel extremely quickly along the neurone cell surface membrane from one end of the neurone to the other Unlike a normal...
Sequence of Events Resulting in an Action Potential The surface of the tongue is covered in many small bumps known as papillae The surface of each papilla is covered in many taste buds Each taste b...
Sensory Receptor Cells A cell that responds to a stimulus is called a receptor cell Receptor cells are transducers – they convert energy in one form (such as light, heat or sound) into energy in an...
Neurones Neurones have a long fibre known as an axon The axon is insulated by a fatty sheath with small uninsulated sections along its length (called nodes of Ranvier) The sheath is made of myelin,...
