Bmsc207 - Study guides, Class notes & Summaries

what are thin filaments are anchored to? - Answer to the cell membrane or dense bodies what are the 6 major groups that smooth muscle is divided into? - Answer - Vascular (blood vessels walls) - Gastrointestinal (walls of digestive tract and associated organs, ex. gallbladder) - urinary (wall of bladder and ureters) - respiratory (airway passages) - reproductive (uterus in females and other reproductive structures in males and females) - ocular (iris and ciliary body)

what is the flexor? - Answer brings bones together what is the extensor? - Answer moves bones away what percent is skeletal muscle of the total body weight? - Answer 40% what is the muscle fiber? - Answer It is a muscle cell. what is the sarcolemma? - Answer muscle cell membrane

what is one way to increase tension developed by a single muscle fibre? - Answer to increase the rate at which action potentials occur in the fibre what can the whole skeletal muscle force be increased by? - Answer the recruitment of additional motor units what is a motor unit? - Answer a single motor neuron and all the muscle fibres it innervated, one motor neuron innervated one fibre type

Is Myelinated axons larger or smaller diameter axons then unmyelinated? - Answer - Myelinated axons are larger diameter axons (10um about 120 m/sec) - Unmyelinated axons are smaller diameter axons (1.5um about 2 m/sec) What is demyelination? - Answer - only nodes contain Na+ channels, the AP cannot be maintained in the unmyelinated region due to a lack of Na+ channels - current leaks out of the unmyelinated region, increasing the likelihood that the wave of depolarization is subthreshold w...

what is the midbrains? - Answer - junction between lower brainstem and diencephalon (nuclei and tracts) What does the midbrain do? - Answer - primary function is controlling eye movement - also relays auditory and visual reflexes (movement of body in response to these stimuli - contains the substantia nigra

BMSC207 Muscle Overview Exam | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | 100% Pass

where do satellite glial cells exist? - Answer within ganglia (bundles of cell bodies) in the PNS what do the satellite glial cells do? - Answer - forma supportive capsule around the cells bodies of neurons (sensory and autonomic) - supply nutrients - structural support, provide a protective cushion

what is the autonomic nervous system? - Answer - involuntary control of smooth muscle, cardiac muscle, many glands and some adipose tissue what is the autonomic nervous system subdivided into? - Answer - sympathetic - parasympathetic what does the autonomic nervous system work with to maintain homeostasis? - Answer with the endocrine system and behavioral systems

What order do these steps happen? integrating center, output signal, input signal and response - Answer - input signal - integrating center - output signal - response what does local control do? - Answer turns active cells to reduced O2 levels in tissue. what cells send local signals in local control? - Answer Endothelial cells what is the result from local control? - Answer - causes smooth muscle to relax and allow more oxygen to capillary - O2 levels in tissue restored

Are skeletal muscle cells electrically coupled with gap junctions? - Answer No Are smooth muscle cells electrically coupled with gap junctions? - Answer varies (unitary vs multiunit) Are cardiac muscle cells electrically coupled with gap junctions? - Answer yes (within each chamber)