When muscle is stimulated directly to contract, does the rising phase of the twitch begin immediately? If not, why not?
A) No, the rising phase occurs only after a substantial number of muscle fibers have contracted.
B) Yes, it does begin immediately.
C) No, the falling phase of the twitch must occur first.
D) No, electrical and chemical changes at the muscle membrane must occur before contraction.
Answer: D
You might also like to view...
Contraction of the diaphragm assists in
A. expiration. B. inspiration. C. flexion at the waist. D. extension at the waist. E. All of the choices are correct.
The contraction of skeletal muscles plays an important role in the movement of blood in the veins
Indicate whether this statement is true or false.
In the absence of a signal sequence, a newly synthesized protein localizes to the
A) plasma membrane. B) nucleus. C) mitochondria. D) peroxisome. E) cytoplasm.
The extracellular matrix and the local cells that secrete it are collectively known as connective tissue
Indicate whether the statement is true or false