Hormones are long-range chemical messengers specifically secreted into the blood by endocrine glands in response to an appropriate signal
a. True
b. False
Indicate whether the statement is true or false
True
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Infant respiratory distress syndrome (IRDS) is a condition peculiar to premature babies. In IRDS insufficient surfactant is produced. What does this cause and how is it treated?
What will be an ideal response
Which of the following is the connection point between the axial skeleton and appendicular skeleton?
A) pelvis - femur B) vertebra - sacrum C) vertebra - scapula D) sternum - clavicle E) vertebra - skull
Megakaryocytes are specialized cells of the bone marrow responsible for __________.
a. engulfing invading bacteria b. specific immune responses c. formation of platelets d. production of scar tissue in an injured area
Following ejaculation, a phase called resolution occurs. During resolution
A. a feeling of satisfaction occurs. B. sperm cell production increases. C. erection of the penis is maintained. D. orgasm occurs. E. a second ejaculation occurs.