Factors that Affect the Speed of Conduction The?speed of conduction?of an impulse refers to?how quickly the impulse is transmitted?along a neurone It is determined by multiple factors: The?p...
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 sect...
Action Potentials 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 elect...
Resting Potentials Neurones?transmit?electrical impulses, which travel extremely quickly along the neurone?cell surface membrane?from one end of the neurone to the other In a?resting axon?(o...
Calculating Cardiac Output Cardiac output?(CO) is the term used to describe the volume of blood that is pumped by the heart (the left and right ventricle) per unit of time An average adult h...
The Autonomic Nervous System There are several circumstances that can cause an individual's heart rate to increase, such as during exercise The?brain?is involved in this response of the hear...
Investigating Variables that Affect Heart Rate There are a wide range of factors that influence the heart rate of an organism Experiments can be designed to investigate the effect of a named...
Heart Action: Initiation & Control Control of the basic heartbeat is?myogenic, which means the heart will beat without any external stimulus This intrinsic rhythm means the heart beats a...
The Human Retina The eye is a?sense organ?containing receptors sensitive to light intensity and colour Receptors?are groups of specialised cells that can generate an electrical impulse in a ...
