Biology > STUDY GUIDE > Midterm 1 practice question and notes graded A+ (All)

Midterm 1 practice question and notes graded A+

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In the diagram, which is the mastoid process? a) J b) K c) G d) H e) I Answer: a Osteoporosis is most common in elderly women because of the lack of , which would inhibit . a) hGH; osteoc ... last activity b) estrogen; osteoclast activity c) IGFs; chondrocyte activity d) PTH; osteoblast activity e) Calcitonin; osteoclast activity Answer: b Which of the following selections correctly lists the sequence of events that occur during intramembranous ossification? a) Ossification center develops > Calcification > Formation of trabeculae > Development of new periosteum. b) Calcification > Ossification center develops > Formation of trabeculae > Development of new periosteum. c) Ossification center develops > Formation of trabeculae > Calcification > Development of new periosteum. d) Development of new periosteum > Ossification center develops > Calcification > Formation of trabeculae. e) Ossification center develops > Calcification > Development of new periosteum > Formation of trabeculae. Answer: a In endochondral ossification, what is the original source of osteoblasts? a) endoderm b) mesenchyme c) mucus connective tissue d) osteoprogenitor cells e) ectoderm Answer: d During endochondral ossification in a fetus, bones initially develop as a cartilage model that was formed from a) periosteum. b) endosteum. c) perichondrium. d) mesenchyme. e) mucous connective tissue. Answer: d Contraction of myofibrils within a muscle fiber begins when a) sodium enters the muscle fiber b) acetylcholine binds to ligand gates c) calcium is released from the sarcoplasmic reticulum d) an action potential travels t-tubules e) calcium is moved into the sarcoplasmic reticulum Answer: c Skeletal muscle contraction is triggered to begin when calcium is released from a) myofibrils b) mitochondria c) terminal cisterns of sarcoplasmic reticulum d) T-tubules Answer: c All of the muscle fibers within the muscle are fully contracted in a) A b) B c) C d) D Answer: D Diltiazem is a calcium channel blocker, reducing free intracellular calcium. What stage of the a) Latent period b) Contraction period c) Relaxation period d) All myogram stages are [Show More]

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