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Biophysics

Biophysics Of Muscle Contraction

Basic muscle properties,.Sceletal, cardiac, smooth muscles and the differences. Basic muscle and muscle cell structure (myofibril, sarcomere, actin, myosin...). Motor unit, neuro-muscular junction, acetylcholine, end-plate potential. T tubules, sarcoplasmic reticulum, muscle fiber action potential. Muscle contraction and its control (tropomyosin), role of Ca ions and ATP. Single muscle twitch, superposition, summation, tetanus (unfused, fused), rigor mortis. Single unit and multiunit smooth muscle, gap junction, syncytium. Cardiac muscle structure, intercalated discs, Ca induced Ca release. Cardiac muscle action potential, the duration of action potential, summation of contraction.

 
author: Ivan Poliaček, Ján Jakuš | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: muscle | attachment: 1 | viewed: 4698x | published on: 10.11.2010 | last modified on: 19.5.2011

Radioactivity and ionizing radiation

The aims of the lecture

atomic structure ionization ionization vs. excitation (low vs. high energy photon) production of ionizing radiation basic particles and their properties mechanisms of interaction basic units basics of the damage of biological material

 

 
author: Ivan Poliaček | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: radioactivity, ionizing radiation | attachment: 1 | viewed: 2726x | published on: 19.11.2008 | last modified on: 22.5.2011

Biophysics of heart and circulation

Heart as a source of biopotentials. Heart as a pump. Blood flow in vessels.

Anatomy of Heart. Hearth - Source of Electric Biopotentials. Action Potential of Sinoatrial Node and Prepotential. Spreading of Electric Depolarisation in Heart. Heart as a Pump.  Dynamic of Heart. Blood Pressures in Heart. Elasticity of aorta and arteries. Blood Circulation. Blood flow - types.  Types of Blood pressures. Measurement of BP. Filtration at Capillary Loop.
 

 
author: Ján Jakuš | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: Biophysics of heart and circulation, Biophysics of heart and circulation | attachment: 1 | viewed: 4107x | published on: 20.10.2008 | last modified on: 16.2.2016

Biophysics of Breathing

Anatomy of Breathing. External and Internal Breathing. Respiratory and Cardiovascular Relationships.  Ventilation - the role of respiratory muscles. Ventilation - types (in adults). Origine of Breathing. Mechanics of breathing. The Lung Volumes.The Lung Capacities. Morphology of Alveoli and Capillaries (Coupling of respiratorz and Cardiovascular System). Diffusion through the alveolo - capillary membrane. Dynamics of Diffusion.

 
author: Ján Jakuš | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: Biophysics of Breathing | attachment: 1 | viewed: 3232x | published on: 1.6.2008 | last modified on: 16.2.2016
 

Biophysics Of Action Potential & Synapse

Depolarization, repolarization, hyperpolarization, action potential – the shape, mechanisms, refractory periods, propagation of action potential (continual spreading, saltatory conduction), electrical stimulation – rheobase, chronaxy, graded potential, synapse, neurotransmitter, mechanisms of transmission receptors (ionotropic vs. metabotropic), EPSP, IPSP, summation (temporal, spatial), convergence, divergence.

 
author: Ivan Poliaček, Ján Jakuš | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: synapse, action potential | attachment: 1 | viewed: 2433x | published on: 10.11.2010 | last modified on: 19.5.2011

Biophysics of hearing

Ear - anatomy. Composition of Inner Ear. Organ of Corti - composition. Mechanism of hearing.

 
author: Ján Jakuš | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: Biophysics of hearing, Biophysics of hearing | attachment: 1 | viewed: 4102x | published on: 10.11.2008 | last modified on: 16.2.2016

Biophysics of perception, receptors, vision

Sensory perception. Reflex arc. Local response and Action potencial. Coding of sensory information on Paccinian Corpuscle (a skin receptor for touch and pressure). Coding of Stimulus on paccinian corpuscle. Receptors - Definition and properties. Receptors - Classification. The Flight Reflex. Laws of Sensory Perception. The Law of Adaptation. Receptor Adaptation. Biophysics of Vision. Anatomy of the Eye. Scheme of the Eye. Vitreous body. Retinal Background. COLOR VISION (HELMHOLTZ -YUANG THEORY of Color Vision). MYOPIA (Nearsightedness). Hyperopia - Farsightedness. PRESBYOPIA - OLDSIGHTEDNEES. Refraction Failures - scheme.

 
author: Ján Jakuš | JLF UK v Martine | discipline: Biophysics | category: Lectures, Presentations | keywords: Biophysics of perception, receptors, vision, Biophysics of perception, receptors, vision | attachment: 1 | viewed: 4106x | published on: 15.9.2008 | last modified on: 16.2.2016