Unmyelinated fibres differ from myelinated fibers in that they ______________?
(A) Have increased excitability
(B) Have to nodes of Ranvier
(C) Have no power of regeneration
(D) Have no association of Schwann cells
The Sensory receptors serving the stretch reflex are classified as___________?
(A) Proprioceptors
(B) Nociceptors
(C) Exteroceptors
(D) Chemo receptors
Abdominal visceral pain is transmitted by ________________?
(A) fibers
(B) fibers
(C) Parasympathetic fibers
(D) Sympathetic fibers
Absolute period when whole heart is in diastole is______________?
(A) 0.7 seconds
(B) 0.3 seconds
(C) 0.7 seconds
(D) 0.4 seconds
Effect on force of contraction of heart is_____________?
(A) Chronotropic effect
(B) Dromotropic effect
(C) Bathmotropic
(D) Ionotropic effect
Distribution of blood flow is mainly regulated by the________________?
(A) Arteries
(B) Arterioles
(C) Capillaries
(D) Venules
Ventricular muscle receives impulses directly from the_______________?
(A) Purkinje system
(B) Bundle of HIS
(C) Right and left bundle branches
(D) AV node
Isovolumetric relaxation ends immediately after________________?
(A) AV Valve closes
(B) When ventricular pressure falls below aortic pressure
(C) When ventricular pressure falls below atrial pressure
(D) None of the above
Heart muscle, true are all except_______________?
(A) Act as syncytium
(B) Has multiple nuclei
(C) Has gap junctions
(D) Has branching