Question

question 1 (2.5 points)
the hormone secreted by the pineal gland is ______.
a) prostaglandins
b) melatonin
c) oxytocin
d) calcitonin
question 2 (2.5 points)
the part of a skeletal muscle that is attached to a fixed structure is called the ______
a) ligament

Explanation:

The pineal gland is known to secrete melatonin which regulates sleep - wake cycles. Prostaglandins are produced in various tissues and have different functions. Oxytocin is produced by the hypothalamus and released by the posterior pituitary gland. Calcitonin is secreted by the thyroid gland. For the second question, the part of a skeletal muscle attached to a fixed structure is the origin. A ligament connects bone to bone.

Answer:

Question 1: B. melatonin
Question 2: (No options completed for second - question answer in provided text, but if we assume correct option is 'origin' based on knowledge, it's not among given options here. If we just focus on first question answer) B. melatonin