The Role of Auxin in Elongation Growth Plant hormones (also known as plant growth regulators) are responsible for most communication within plants Auxins are a type of plant growth regulator that i...
Electrical Communication in the Venus Flytrap Plants possess communication systems that enable them to coordinate the different parts of their bodies The Venus flytrap is a carnivorous plant that g...
Sliding Filament Model of Muscular Contraction Structure of thick & thin filaments in a myofibril The thick filaments within a myofibril are made up of myosin molecules These are fibrous protei...
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...
