Answer the following statements true (T) or false (F)
1. Muscle spasms of the back often are due to the erector spinae contraction.
2. Muscles connecting to the hyoid bone are important for swallowing and speech.
3. The muscles of facial expression insert into skin or other muscles, not bones.
4. Once a motor neuron has fired, all the muscle fibers in a muscle contract.
5. The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment.
1. TRUE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Which of the following structures propagates action potentials from the surface of a muscle fiber to its interior?
A. The sarcomeres B. The sarcoplasmic reticulum C. The endomysium D. The myofibrils E. The T tubules
Which of the following muscles is involved in crossing one leg over the other while in a sitting position?
A) gastrocnemius B) sartorius C) all of the hamstrings D) quadriceps femoris
In which step(s) of the catabolism of nutrients is/are oxygen directly consumed?
A. Glycolysis and the Krebs cycle B. Krebs cycle C. Oxidative phosphorylation D. Krebs cycle and oxidative phosphorylation E. Glycolysis
Describe the similarities between the skeletal structures of the upper and lower limbs.
What will be an ideal response?