TOTAL QUESTION 3

  TOTAL QUESTION 5

6.1.1 State one structural feature of xylem vessels and explain how this is related to the function of water transport. (2)   Feature Explanation    

  QUESTION 5  

39.    The most rapid “saltitory” propagation or “hopping” of an action potential (“nerve impulse”) down an axon occurs only in what type of neurons? a.    myelinated type A and non-myelinated type C neuronsb.    unmyelinated and myelinated type A and B neuronsc.    type C neurons onlyd.    type B neurons onlye.    myelinated type A neurons only  

7.  Which organ below does NOT contain muscle fibers? a.    cardiac muscleb.    skeletal musclec.    striated muscled.    smooth musclee.    tendons

27.    What SM division of the nervous system controls voluntary contractions of the skeletal muscles? a.    sympathetic division of the autonomic nervous system (VM)b.    parasympathetic division of the autonomic nervous system (VM)c.    visceral motor division nervous system (VM)d.    somatic sensory division of the peripheral nervous system (SS)e.    somatic motor division of the peripheral nervous system (SM)  

3.  What are the I bands of the sarcomere primarily composed of? a.    thick & thin filamentsb.    thick filaments containing myosinc.    thin filaments containing actin & troponind.    mysoin & troponine.    actin & mysoin

8.  What tunnel shaped part of the skeletal muscle cell carries action potentials (nerve impulses)      from the cell  membrane, to the sarcoplasmic reticulum? a.    sarcoplasmab.    sarcolemmac.    sarcomered.    t-tubules or transverse tubulese.    myoneural junction

9.  Based on the choices below, what is the correct order of events that occurs in muscle      contraction? a.    pivoting heads, ATP caused detachment, relaxation, attachment cross bridgingb.    ATP caused detachment, pivoting heads, attachment cross bridging, relaxationc.    attachment cross bridging, pivoting heads, ATP caused detachment, relaxationd.    attachment cross bridging, pivoting heads, relaxation, ATP caused detachmente.    pivoting heads,  attachment cross bridging, relaxation, ATP caused detachment