the ________ system controls brain and spinal cord central The ________ nervous system controls the skeletal muscles. autonomic parasympathetic afferent sympathetic somatic somatic The part of the peripheral nervous system that carries sensory information to the CNS is designated autonomic. motor. afferent. efferent. somatic. afferent The efferent division of the peripheral nervous system innervates: glandular cells heart muscle cells smooth muscle cells skeletal muscle cells All of
Premium Action potential Neuron
heart‚ resulting from the propagation of many action potentials. The ECG graph is composed of parts called P‚ Q‚ R‚ S‚ and T. The P wave is associated with depolarization. The PR segment is a flat line that indicates the signal has left the right atrium and entered the ventricles. The Q‚ R‚ S complex has to deal with the ventricular depolarization and repolarization. As the signal passes out of the ventricles‚ the ventricular walls begin to relax and recover. The T wave is known as the ventricular diastole
Premium Heart Blood Exercise physiology
channels for sodium. As the sodium concentration is very high in the outside when the sodium channels are open to the polarity is reversed ‚ so that the interior of the neuron reaches a value electropositive with respect to the outside. If depolarization causes a change in potential of 120 millivolts more than we had the inside is said to have reached the action potential‚ which is the transmission of the nerve impulse to the next neuron‚ because it creates the conditions in the cell interior
Premium Action potential Neuron
on motor end plate. Then Ach receptor channel opens and increases permeability of Na+ into karyoplasms. This allows sodium gates to open. Na+ enters muscle fiber‚ rapid depolarization of sarcolemma occurs. Voltage changes to a less negative charge. An increase of Na+ rushing into cell allows for more gates to open (depolarization wave). Acetylcholinesterase is an enzyme that resets and closes gates once Ach is removed from its receptor. Once sodium gates close it initiates K+ gates to open. K+ rushes
Premium Acetylcholine Action potential Myosin
is a lower concentration for Na extracellularly this causes the cell membrane to become more positive inside creating a depolarized cell membrane potential.(8) Both Ca and Na have a positive additive effect upon the membrane potential causing a depolarization in the membrane‚ and decreasing the membrane
Premium Cell membrane Protein Cell
Describe the Cardiac Cycle The Cardiac cycle is a description of the activities that take place in the period from the start of one heart the next. The conducting system autonomically controls the heart beat impulses it is also called the cardiac conduction system or the nodal system. It is made up of six main components the sinoatrial node (SA-Node)‚ internodal paths‚ atrioventricular node (AV-Node)‚ atrioventricular bundle (AV bundle) or bundle of His‚ bundle branches and Purkinje fibres. Contractile
Premium Heart Blood Circulatory system
The Action Potential An action potential‚ also called a spike‚ nerve impulse‚ and discharge‚ is the rapid reversal of charge of the cell membrane. These changes in charge occur within milliseconds‚ meaning the action potential travels very quickly down the axon in order to convey information over long distances. This transfer of information occurs within six phases and requires the presence of multiple pumps and channels embedded in the membrane to control ion concentration. Phase 1: The Resting
Premium Action potential
2008-12495 권성연 2014년도 2학기 신경과학 제출일자 11월 26일 Weekly Q&A (25) 1. Outline the steps involved in the presynaptic release of neurotransmitter. Why would the closure of a potassium channel in the presynaptic axon terminal change the amount of Ca2︎ entering and change the amount of neurotransmitter released? Serotonin(5-HT) receptor on the sensory axon terminals is a G-protein-coupled metabotropic receptor. Stimulation of this receptor leads to the production of intracellular second messengers‚ cAMP‚ which
Premium Neuron
The three different waveforms are a representation of the electrical activity of the heart. The P wave represents the depolarization of the atrial valve. The QRS complex represents the depolarization of the ventricular valve. Also‚ the T wave represents the repolarization of the ventricular valve. The change in amplitude represents the different heartbeat patterns such as normal‚ fast‚ slow‚ or irregular heartbeats
Premium Heart Blood pressure Blood
The formation of an action potential can be divided into five steps. (1) A stimulus from a sensory cell or another neuron causes the target cell to depolarize toward the threshold potential. (2) If the threshold of excitation is reached‚ all Na+ channels open and the membrane depolarizes. (3) At the peak action potential‚ K+ channels open and K+ begins to leave the cell. At the same time‚ Na+ channels close. (4) The membrane becomes hyperpolarized as K+ ions continue to leave the cell. The
Premium Management Marketing Psychology