Answer:
D
Explanation:
myosin heads form cross bridges and pull thin filaments causing them to slide.
the presence of acetocholene causes calcium to be released causing depolarization of the sarcoplasmic reticulum and changing its shape. the myofilaments together with actin allows the myosin to form cross bridges along the muscle fibers and releases ATP for movement of the muscle.
Answer: Not having motivation
Explanation:
A.
The endurance of an athlete is dependent on his or her body's ability to uptake oxygen efficiently, a task carried out by the red blood cells.
Answer:
D. It varies from joint to joint
Explanation:
Not A: Your ankle and wrist have different flexibilities
Not B: A sibling won't have the same flexibility
Not C. Again, ankle vs wrist
D. Yes
Answer: pathogens
blood borne pathogens consist of HIV, Hepatitis B and C, and many others
