________ are hormones released by neurons and enter the blood for distribution throughout the body.
A. Exocrine secretions
B. Paracrine signals
C. Neurotransmitters
D. Neuroendocrine secretions
Answer: D
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The lens of the eye flattens when
A. extrinsic eye muscles contract. B. intrinsic muscles of the iris contract. C. extrinsic eye muscles relax. D. ciliary muscles contract. E. ciliary muscles relax.
This figure illustrates the microscopic anatomy of spongy bone. Which is a mature bone cell?
A. 1 B. 2 C. 3 D. 4 E. None of the choices is correct.
The internal intercostal muscles are inspiratory muscles because they lift the ribs upward and outward to enlarge the thoracic cavity
Indicate whether the statement is true or false
Which organelle is a small vesicle containing oxidative enzymes?
A. Nucleolus B. Peroxisome C. Golgi apparatus D. Endoplasmic reticulum E. Flagellum