Physiology 1st Week: Tissues and Cells Course Outline Quiz
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Questions and Answers

What is the main function of epithelial tissue discussed in the text?

  • Movement
  • Impulse transmission
  • Protection (correct)
  • Support

Which tissue type is responsible for providing impulse transmission?

  • Muscle tissue
  • Nervous tissue (correct)
  • Connective tissue
  • Epithelial tissue

What is the role of connective tissue according to the text?

  • Movement
  • Impulse transmission
  • Protection
  • Support (correct)

Which system involves the functional unit known as nephrons?

<p>Excretory system (B)</p> Signup and view all the answers

Which system of the body involves gulp secretion and reabsorption of water filtered through the henle loop of nephrons?

<p>Digestive system (A)</p> Signup and view all the answers

Which tissue type is specialized for moving the body and its parts through contraction and relaxation?

<p>Muscle tissue (A)</p> Signup and view all the answers

What is the primary function of dendrites in a neuron?

<p>Receive information from neighboring neurons and transmit it to the neuron body (A)</p> Signup and view all the answers

What feature increases the electrical conduction speed of neurons?

<p>Myelin covering (D)</p> Signup and view all the answers

Which part of a neuron is responsible for initiating voluntary movements like walking?

<p>Cell body (B)</p> Signup and view all the answers

What is a function of the Nerve System mentioned in the text?

<p>Provides control of spinal cord reflexes (C)</p> Signup and view all the answers

What is one of the characteristics of most neurons mentioned in the text?

<p>They are single cells (C)</p> Signup and view all the answers

What is the role of Schwann cells in a neuron?

<p>Provide myelin covering (D)</p> Signup and view all the answers

What is responsible for the conduction of nerve impulses in myelinated fibers?

<p>Depolarization at Ranvier nodes (B)</p> Signup and view all the answers

Which type of synapse releases neurotransmitters that cause action potentials in the postsynaptic cell?

<p>Chemical synapse (B)</p> Signup and view all the answers

How does electrical synaptic conduction differ from chemical synaptic conduction?

<p>Chemical synapses are more common in the central nervous system (A)</p> Signup and view all the answers

What happens when the threshold is exceeded in a synapse?

<p>Depolarization (B)</p> Signup and view all the answers

Why do myelinated fibers conduct electricity faster than unmyelinated fibers?

<p>Jumping conduction at Ranvier nodes (A)</p> Signup and view all the answers

What occurs when neurotransmitters are released into the synaptic cleft?

<p>Stimulation of action potentials in the postsynaptic neuron (C)</p> Signup and view all the answers

What is the primary function of glial cells in nervous tissue?

<p>To aid nerve conduction (B)</p> Signup and view all the answers

What is the net effect of the sodium-potassium ion pump?

<p>Three Na+ ions leave the cell and two K+ ions enter (B)</p> Signup and view all the answers

What is the term for when the inside of the membrane gains a more positive value than the outside?

<p>Depolarization (A)</p> Signup and view all the answers

Which ions are responsible for the action potential in muscle and nerve conduction?

<p>Sodium and Potassium (B)</p> Signup and view all the answers

What is the electrical property of the cell membrane when it is at rest?

<p>Electrically charged (D)</p> Signup and view all the answers

What is the term for the potential changes that occur in the membrane when the cells are active?

<p>Action potential (B)</p> Signup and view all the answers

What is the process called when the membrane potential returns to its resting state after depolarization?

<p>Repolarization (D)</p> Signup and view all the answers

What is the approximate threshold potential value that a neuron must reach for an action potential to be generated?

<p>-55 mV (B)</p> Signup and view all the answers

During which phase of an action potential does the permeability of the membrane to K+ ions increase?

<p>Repolarization (B)</p> Signup and view all the answers

What are the substances that transmit impulses at synapses called?

<p>Neurotransmitters (C)</p> Signup and view all the answers

What happens to the membrane potential during the depolarization period?

<p>The membrane potential increases rapidly due to Na+ ions entering the cell (B)</p> Signup and view all the answers

What are synapses in the context of neurons?

<p>The spaces between neurons that enable communication (B)</p> Signup and view all the answers

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