Describe the steps involved in bone growth by endochondral ossification.
What will be an ideal response?
1. A cartilaginous model develops and becomes calcified during fetal development.
2. Osteoblasts cover the diaphysis with a compact bone collar.
3. Blood vessels bring osteoblasts into the cartilage. At the primary ossification center, osteoblasts form spongy bone.
4. The medullary cavity forms, the compact bone collar thickens and secondary ossification centers appear at the epiphyses.
You might also like to view...
Pyrite (FeS2) is common in bituminous coal and metal ores and is a critical component of the microbial leaching of ores and acid mine drainage
Indicate whether the statement is true or false.
A tracer is a substance with what attached to it?
a. water b. carbon c. a radioisotope d. an ion e. a positron
Which one of the following is a true statement comparing phospholipids and triacylglycerols (fats and oils)?
A. Both molecules contain a phosphate group. B. Triacylglycerols may be saturated or unsaturated, but all phospholipids are saturated. C. Phospholipids are the primary storage form for fats in our bodies. D. Phospholipid molecules have a distinctly polar "head" and a distinctly nonpolar "tail," whereas triacylglycerols are predominantly nonpolar. E. In nature, phospholipids occur in fused rings (sterol form), whereas triacylglycerols maintain a straight-chain form.
When a neuron is at its "resting potential," which of the following is true about the concentration of sodium ions?
A) Sodium ions have a greater concentration outside the neuron's cell membrane. B) The sodium concentration is the same outside and inside the neuron's cell membrane. C) Sodium ions have a greater concentration inside the neuron's cell membrane.