Depolarisation - Studienführer, Klassennotizen & Zusammenfassungen

AQA A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023 | VERIFIED. (There are) stretch-mediated sodium ion channels (in the membrane); 2. (Increased pressure) deforms/changes (sensory neurone/axon) membrane/lamella(e) OR (Increased pressure) deforms/changes sodium ion channels; 3. Sodium ion channels open; 4. Sodium ions diffuse in; 5. Depolarisation (leading to generator potential); 3 max (3 x AO1) 1. 2. 3. or 4. Accept Na+ Max 2 if only reference to sodium and not sodium ion...

Cardiovascular System Practice Questions Guaranteed A+ The muscles that contract to tension the chordae tendinae are called a. Atrioventricular node b. Atrial myocardium c. Papillary muscles d. Pectinate muscles ️C. Blood flowing through the heart travels from the right atrium to the right ventricle then up through the semilunar valve into the ___________ on its way to the lungs a. Aorta b. Inferior vena cava c. Pulmonary arteries d. Pulmonary veins e. Superior vena ca...

AQA-7402-2-BIOLOGY FINAL MARK SCHEME PAPER 2-A LEVEL--Jun24.GRADED A. Question Marking Guidance Mark Comments 01.1 A = mitochondrion B = presynaptic membrane/neurone C = (synaptic) vesicle(s) D = synaptic gap/cleft;; 2 (2 x AO1) 4 correct = 2 marks 2–3 correct = 1 mark 0–1 correct = 0 marks A. Accept mitochondria/crista(e). B. Accept synaptic knob/bulb or motor neurone. B. Accept nerve cell for neurone. Question Marking Guidance Mark Comments 01.2 1. Ace...

The layers of the wall of the heart beginning with the outermost layer are: - ANSWERepicardium, myocardium, endocardium collateral circulation - ANSWERcirculation formed by smaller blood vessels branching off from or near larger, occluded blood vessels arterial lumen - ANSWERLayer of blood vessel that is made up of elastic fibers and muscle to provide strength and contractility Cardiac Output is influence by - ANSWERHR and/or Stroke Volume Automaticity is most accurately defined as t...

HUBS 1406 Cardiovascular Practice Quiz with Complete Solutions HUBS 1406 Cardiovascular Practice Quiz with Complete Solutions HUBS 1406 Cardiovascular Practice Quiz with Complete Solutions The electrical activation (depolarisation) of the ventricles is represented on an electrocardiogram by the: - ANSWER-QRS complex The left atrioventricular valve is closed: - ANSWER-by the contraction of the left ventricle Which of the following is true about veins? - ANSWER-They are known as cap...

what is electrocardiography (ECG) is a diagnostic tool used to record the rhythm, rate and electrical activity of the heart examples of use anesthesia emergency heart disease syncope cardiac arrhythmia and murmur what are the waves known as in ECG P, Q R S T what is the P wave Arises when the impulse from the SA node sweeps over the atria causing depolarisation What is the QRS complex? ventricular depolarisation what is the T wave ventricular repolar

HUBS 191 Nervous System Latest Update 100% Solved Resting membrane potential -70mV Open Voltage gated ion channels are ? at -60mV Inactive Voltage gated ion channels are ? at+30mV Na+ Extracellular fluid as a high ? concentration and is therefore positive in comparison to the ICF K+ Intercellular fluid has a high ? concentration and is therefore slightly negative in comparison to the ECF Depolarisation The change from a negative resting potential to a positive action poten...

ECG 2023 Exam Questions with Correct Answers What is sinus rhythm? - Answer-Normal heart rhythm, with the electrical activation beginning in the SA node Which part of the ECG corresponds to the contraction of the atria? - Answer-P wave Which part of the ECG corresponds to the depolarisation of the ventricles? - Answer- The QRS complex On the ECG what does the T wave correspond to? - Answer-Re-polarisation of the ventricles On an ECG what is a U wave? - Answer-An extra wave seen on t...

HUBS1416 Practice Exam Questions and Answers Which of the following would be expected to inhibit the generation of an action potential? a) Inflammation of the myelin sheath b) Stimulating GABA receptors c) Blocking acetylcholine receptors d) Activating adrenalin receptors -Answer-b) Stimulating GABA receptors Which is true about neurons? a) At rest a neuron will have a negative membrane potential, due to it having more open K+ channels than Na+ channels b) Inhibitory neurons will relea...

What are myofibrils? - Answer They are cylindrical organelles that run along the length of muscle fibres, they are the site of muscle contraction How are myosin and actin filaments arranged? - Answer In an alternating pattern in sarcomeres, thick myosin filaments overlap with the thin actin filaments at each end What is a pair of muscles called? - Answer An antagonistic pair What is the sarcolemma? - Answer The membrane of muscle fibres what is the mitochandria? - Answer ...