This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Which molecule prevents a muscle contraction from occurring when the muscle is at rest? a. ... (Read 38 times)

nelaaney

  • Hero Member
  • *****
  • Posts: 560
on: Jun 25, 2018
Which molecule prevents a muscle contraction from occurring when the muscle is at rest?
 
  a. Calcium
  b. Troponin-tropomyosin
  c. Actin
  d. Myosin

Question 2

Which characteristic of a postural muscle is a result of having substantial amounts of type I mus-cle fibers?
 
  a. Resists fatigue
  b. Rapid response time
  c. Little contractibility
  d. Lacks a fascia lining


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

wilsonbho

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Contraction begins as the calcium ions combine with troponin, a reaction that overcomes the in-hibitory function of the troponin-tropomyosin system. Calcium, actin, and myosin all facilitate muscle contraction.

Answer to Question 2

ANS: A
Postural muscles have more type I fibers, allowing them the high resistance to fatigue that is nec-essary to maintain the same position for extended periods. The ocular muscles have more type II muscle fibers, allowing them to respond rapidly to visual changes.
Little contractibility or lacking a fascia lining is associated with type I muscle fibers.


nelaaney

  • Member
  • Posts: 560
Reply 2 on: Jun 25, 2018
Gracias!

Laurenleakan

  • Member
  • Posts: 309
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

da vinci muscle da vinci muscle
Anatomy of Skeletal Muscle Anatomy of Skeletal Muscle
Recruitment of Muscle Fiber Type Recruitment of Muscle Fiber Type
Pinch the sternocleidomastoid (SCM) muscle at points along its length. Turn head to side to expose ... Pinch the sternocleidomastoid (SCM) muscle at points along its length. Turn head to side to expose ...
Schematic models of an IgG antibody molecule and an Fab fragment Schematic models of an IgG antibody molecule and an Fab fragment
A fictional element named Nivadium is found to have three naturally occurring is A fictional element named Nivadium is found to have three naturally occurring is
Video: Electrical Conduction System of the Heart

For a complete list of videos, visit our video library