x
Info
x
Warning
x
Danger
 / 
 / 
 / 
11.Cross bridges a.bind to actin during muscle contraction b.are globular heads made

Question : 11.Cross bridges a.bind to actin during muscle contraction b.are globular heads made : 1417081

 

11.Cross bridges

a.bind to actin during muscle contraction

b.are globular heads made of myosin

c.do not bend during muscle contraction

d.have characteristics a and b

e.have characteristics b and c

12.Order the following muscle cell components from larger to smaller

1.troponin

2.myofibril

3.sarcomere

4.thin filament

5.muscle fiber

a.3, 4, 1, 5, 2

b.1, 2, 3, 5, 4

c.5, 4 ,3 , 1, 2

d.5, 2, 3, 4, 1

e.3, 4, 5, 2, 1

13.Skeletal muscle fibers

a.have T tubules within their sarcomeres

b.have Z lines extending down the middle of the I bands

c.contain gap junctions

d.have all of the above characteristics

e.have characteristics b and c

14.The region between two Z lines is a

a.muscle fiber

b.myofibril

c.myofilament

d.sarcomere

e.sarcoplasmic reticulum

15.Skeletal muscle fibers

a.are some of the longest cells in the body

b.are attached end-to-end within a muscle

c.contain Z lines within their A bands

d.contain only one nucleus

e.exhibit characteristics b and c

16.Identify the characteristic(s) shared by all types of muscle tissues?

a.They are neurogenic.

b.They have T tubules.

c.They have tropomyosin.

d.They attach to tendons.

e.They have neuromuscular junctions.

17.The functional unit of skeletal muscle

a.is the smallest contractile component of a muscle fiber

b.is the area between two Z lines

c.is the sarcomere

d.contains only one A band

e.exhibits all of the above characteristics

18.Troponin

a.binds with calcium to allow sarcomere shortening

b.breaks down myosin cross bridges

c.is an enzyme in the sarcomere

d.forms the boundaries of a sarcomere

e.has an ATPase site

19.During contraction of a sarcomere,

a.the Z discs move farther apart

b.the A bands become thicker

c.the I bands become narrower

d.the thin filaments become shorter

e.events c and d occur

20.A function of tropomyosin is

a.to bind Ca2+

b.to form attachments with myosin cross bridges

c.to prevent myosin cross bridges from attaching to the thin filaments

d.to act as an ATPase

e.none of the above

 

Solution
5 (1 Ratings )

Solved
Biology 1 Year Ago 49 Views
This Question has Been Answered!
Unlimited Access Free
Explore More than 2 Million+
  • Textbook Solutions
  • Flashcards
  • Homework Answers
  • Documents
Signup for Instant Access!
Ask an Expert
Our Experts can answer your tough homework and study questions
180472 Biology Questions Answered!
Post a Question