Year 1 MBChB Physiology crash course

What is the name given to invaginations of the sarcolemma that coordinate muscle contractions in the heart?

• Plasma membrane

• T-Tubules

• Sarcoplasmic reticulum

• Striations

• Gap junctions

What do cholinergic receptors do when active?

• Vasodilation

• Bronchodiliation

• Increase heart rate

• Decrease heart rate

• Increase force of contraction

What is roughly the heart rate when controlled by the AV Node?

• 10-50

• 20-40

• 40-60

• 50-80

• 60-100

What happens during the QT interval of an ECG?

• Ventricular depolarization

• Atrial depolarization

• Electrical activity of the ventricles

• Delay by the AV node

• Atrial repolarization

"The total pressure exerted by a mixture of non-reacting gases is equal to the sum of each partial pressures of each individual gas"

Is which law?

• Henry's law

• Dalton's law

• Boyle's law

• Bohr effect

An increase in the temperature in the blood would cause what effects?

• Right shift on the oxygen dissociation curve

• Left shift on the oxygen dissociation curve

• Hb higher affinity for oxygen

• Hb lower affinity for oxygen

• Less unloading of oxygen at tissues

Where are the peripheral chemoreceptors found?

• Lungs

• Carotid sinuses

• Aortic Arch

• Brainstem

• Left atrium

Label the volumes of the lung function test

a

b

c

d

Expiratory reserve volume

Tidal Volume

Vital Capacity

Functional residual capacity

What does the ventral medullary group control?

• Sends signals to inhibit inspiration

• Stimulates inspiratory movements

• Monitors pH of blood

• Stimulates expiratory movements

• Sends signals to stimulate inspiration

What does the pneumotaxic centre control?

• Rate of respiration

• Sends inhibitory signals for inspiration

• Depth of breath

• Sends stimulatory signals for inspiration