WorksheetsUnit 2 Lecture 6 Review
Total questions: 15
Worksheet time: 10mins
1.Which of the following statements best describes homeostasis?
a) Keeping the body in a fixed and unaltered state.
b) Dynamic equilibrium.
c) Maintaining a near-constant internal environment.
d) Altering the external environment to accommodate the body's needs.
3. Which of the following hormone regulates calcium when levels drop too low?
a) Parathyroid hormone
b) calcitriol
c) calcitonin
d) thyroid hormone
Which of the following hormones is not important in calcium homeostasis?
Calcitonin
Parathyroid hormone
Thyroid hormone
Which of the following statements regarding calcium homeostasis is not true?
Calcium concentrations are monitored in the parathyroid and thyroid glands
Inhibition of osteoclast activity helps restore high extracellular calcium concentration to normal levels.
Calcitonin and parathyroid hormone have opposing effects on extracellular calcium concentration.
Thyroid and growth hormone have opposing effects
Calcium is a mineral that people need to help with
Strong bones & teeth
blood clotting
muscle contraction
none of the above
all of the above
Bone forming cells
Osteocytes
Osteoclasts
Osteoblasts
Bone cells that break down the bone surface
Osteoblasts
Osteoclasts
Osteocytes
Mature bone cells that help maintain the matrix (which includes calcium).
Osteoblasts
Osteoclasts
Osteocytes
When blood calcium levels are low, this cell releases calcium from the bone into the blood
Osteocytes
Osteoblasts
Osteoclasts
Cells that produces acids that dissolve the bone to release calcium.
osteocyte
osteoclast
osteoblast
Cell that produces bone matrix to bind calcium in the bone.
osteocyte
osteoclasts
osteoblast
Vitamin D is needed in order for calcium to be absorbed.
True
False
The body uses __________ ___________ as a reservoir for, and source of calcium , to maintain constant concentrations of calcium in blood, muscle, and intercellular fluids
(a)
When there is an increase in calcium level the (a) gland is activated and releases calcitonin that stimulates calcium deposition in bones and reduces calcium uptake in kidneys that brings calcium level back to set point.
When the blood calcium level is too low the (a) Gland stimulates osteoclasts to break down bone and release calcium.
