HUBS 191 progress test 2 Questions and Answers |100% Verified and Updated

HUBS 191 progress test 2 Questions and Answers |100% Verified and Updated nucleus -Answer-group of cell bodies in CNS tract -Answer-bundle of axons in CNS grey matter -Answer-cell bodies in spinal cord or cerebral cortex white matter -Answer-axons in spinal cord or cerebral cortex types of neurons -Answer-multipolar, bipolar, unipolar, anaxonic astrocytes (3) -Answer-CNS: supply nutrients to neurons, ensheath blood capillaries, transmit info microglia (2) -Answer-CNS: immune cells, engulf microbes and debris ependymal cells (2) -Answer-CNS: line fluid-filled spaces, cilia to circulate CSF oligodendrocytes (2) -Answer-CNS: support nerve fibres, ensheath with myelin swchann cells (2) -Answer-PNS: support peripheral nerve fibres, ensheath with myelin Afferent -Answer-ascending/sensory Efferent -Answer-descending/motor Somatic Efferent -Answer-voluntary: 2 neurons between brain and skeletal muscle Autonomic Efferent -Answer-involuntary: 3 neurons between brain and effector sympathetic nervous system -Answer-fight or flight parasympathetic nervous system -Answer-rest and digest factors of sympathetic and parasympathetic nervous system (6) -Answer-HR, gastric motility, salivation, pupil size, sweating & blood to muscles myelin -Answer-lipid/fat what happens during an AP? (5) -Answer-resting: VG channels shut depol. to threshold: change in MP rapid depol: VG Na+ open VG Na+ close, VG gate open membrane repolarises to RMP AP will propagate if... -Answer-MP at hillock threshold unmyelinated axons propagation (4) -Answer-develops at initial segment, +30mV Na+ ions spread away, graded DP brings segment 2 to threshold segment 1 now refactory Na+ entering 2 spread, graded DP brings segment 3 to threshold myelinated axons propagation (4) -Answer-AP develops at initial segment local current produces a graded DP that brings the axolemma at node 1 to threshold AP develops at node 1 (initial is no refactory) local current produces a graded DP that brings the axolemma at node 2 to threshold. spinal cord starts at _____ and ends at ________ -Answer-foramen magnum, inferior border of L1 conus medullaris -Answer-tapered end of spinal cord filum terminale -Answer-anchors spinal cord to coccyx