The body contains 11 different organ systems.The ___________ system is responsible for secreting the hormones that help integrate the body's activities.
A) integumentary
B) nervous
C) circulatory
D) endocrine
Correct Answer:
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Q5: _ are chemicals secreted into the space
Q6: The outer layer of bone,referred to as
Q7: Muscle contraction occurs because:
A)myosin filaments pull on
Q8: Muscle cells are unique because of the
Q9: _ is only a single cell layer
Q11: _ are found in soft-bodied invertebrates,such as
Q12: The first type of symmetry to develop,and
Q13: The evolution of bilateral symmetry enabled animals
Q14: _ are a type of connective tissue
Q15: Special bone cells,called _,are responsible for laying
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