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5 Written questions

5 Matching questions

  1. Threshold
  2. Hypothalamus
  3. Myofibrils
  4. Neurotransmitter (NT)
  5. Sarcomere
  1. a The potential that an excitable cell membrane must reach for an action potential to be initiated
  2. b A longitudinal bundle in a muscle cell (fiber) that contains thin filaments of actin and regulatory proteins and thick filaments of myosin
  3. c The fundamental, repeating unit of striated muscle, delimited by the Z lines
  4. d The ventral part of the vertebrate forebrain; functions in maintaining homeostasis, especially in coordinating the endocrine and nervous systems; secretes hormones of the posterior pituitary and releasing factors that regulate the anterior pituitary
  5. e A molecule that is released from the synaptic terminal of a neuron at a chemical synapse, diffuses across the synaptic cleft, and binds to the post synaptic cel, triggering a response

5 Multiple choice questions

  1. A change in a cell's membrane potential such that the inside of the membrane becomes more negative relative to the outside. Hyperpolarization reduces the chance that a neuron will transmit a nerve impulse.
  2. Wrapped around the axon of a neuron, an insulating coat of cell membranes from Schwann cells or oligodendrocytes. It is interrupted by nodes of Ranvier, where action potentials are generated
  3. A phenomenon of neural integration in which the membrane potential of the post-synaptic cell in a chemical synapse is determined by the combined effect of EPSPs or IPSPs produced in rapid succesion
  4. A substance that an organism cannot synthesize from any other material and therefore must absorb in preassembled.
  5. Animal tissue that functions mainly to bind and support other tissues, having a sparse population of cells scattered through an extracellular matrix

5 True/False questions

  1. Interstitial FluidThe fluid filling the spaces between cells in most animals


  2. Graded PotentialA gated channel for a specific ion. The opening or closing of such a channels may alter a cell's membrane potential.


  3. TissuesA specialized center of body function composed of several different types of tissues


  4. Nervous TissueTissue consisting of long muscle cells that can contract, either on its own or when stimulated by nerve impulses


  5. TropomyosinThe regulatory protein that blocks the myosin-binding sites on actin molecules