Lecture+notes+14 - Copy

Lecture+notes+14 - Copy - Lecture Notes Bio 109, Fall 2010,...

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Lecture Notes Bio 109, Fall 2010, Dr. Catherine Loudon Lecture 14 – 10/27/10 – Cardiac cells, conductive pathways of heart 1) Clicker question (answer counts) [10 am section] a) When gamma motor neurons fire, the i) skeletal muscle around the spindle contracts. ii) skeletal muscle around the spindle relaxes. iii) intrafusal fibers relax. iv) intrafusal fibers contract. [correct answer] 2) Clicker question (answer counts) [11 am section] a) Activation of a Golgi tendon organ causes _____. i) reflex inhibition of the muscle [correct answer] ii) stretching of the tendon iii) reflex contraction of the muscle iv) activation of antagonistic muscles 3) Your question – what is the relationship between Fig. 14-10b and 14-7g? Response – the thick muscular walls of the heart chambers shown in Fig. 14-7g are made up of a large number of cells – a single contractile cell is shown in Fig. 14-10b. 4) Two types of cells in the heart: a) cardiac muscle cells (contractile) (99%) b) autorhythmic cells (pacemakers) (1%) 5) Events of contraction in a cardiac muscle (and contrast with skeletal and smooth muscle)
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This note was uploaded on 12/01/2010 for the course BIO SCI Bio Sci E1 taught by Professor Catherineloudin during the Spring '10 term at UC Irvine.

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Lecture+notes+14 - Copy - Lecture Notes Bio 109, Fall 2010,...

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