One of the reasons you might struggle to lift a heavy object with your arm fully extended is because
A. in that posture, some myosin heads overlap actin in the wrong orientation and tug actin in the wrong direction.
B. motor neurons cannot release as much ACh in that posture.
C. in extension, the proximity of Z discs to thick filaments restricts the sliding movement within sarcomeres.
D. full extension results in decreased overlap between thick and thin filaments in the muscle.
Answer: D
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Complete this analogy: Testes are to gonads as sperm are to:
A) ova. B) sex hormones. C) estrogen. D) gametes.
Which of the following is false?
a. at age 6 an individual has more bones than they will as an adult b. infants have fewer bones than an older child c. as adults everyone has the same number of bones d. in old age individuals become shorter due to the changes in posture and compression of cartilage
The epidermis is composed of ________
A) simple columnar epithelium B) stratified squamous epithelium C) adipose tissue D) areolar tissue E) dense fibrous connective tissue
Endocytosis of any kind requires metabolic energy.
Answer the following statement true (T) or false (F)