BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 45, Problem 1A
You take X-rays of two individuals. Ray has been a weight lifter and body builder for 30 years; Ben has led a mostly sedentary life. What differences would you expect in their X-rays?
a. No difference, they would both have thicker bones than a younger person due to natural thickening with age.
b. No difference, lifestyle does not affect bone density.
c. Ray would have thicker bones due to reshaping as a result of physical stress.
d. Ben would have thicker bones because bone accumulates like fat tissue from a sedentary lifestyle.
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You take X-rays of two individuals. Ray has been a weight lifter and body builder for 30 years; Ben has led a mostly sedentary life. What differences would you expect in their X-rays?
a. No difference, they would both have thicker bones than a younger person due to natural thickening with age.
b. No difference, lifestyle does not affect bone density.
c. Ray would have thicker bones due to reshaping as a result of physical stress.
d. Ben would have thicker bones because bone accumulates like fat tissue from a sedentary lifestyle.
Once we reach adulthood and our bones are fully formed and hardened, they cannot be remodeled
A. True
B. False
Bone remodeling involves two hormones; one of these hormones activates the cells
which cause Bone Resorption and one of these hormones causes Bone Deposition
and an increase in Bone Mass. Which of the following statements is true?
16.
20.
A. PTH causes the osteoblasts to increase bone mass.
B. PTH causes an increase in bone mass and a decrease in plasma Calcium.
C. Calcitonin causes an increase in bone mass and a decrease in plasma Calcium.
D. Calcitonin activates the osteoclasts and subsequently decreases bone mass.
Chapter 45 Solutions
BIOLOGY
Ch. 45.1 - Compare hydrostatic skeletons, exoskeletons, and...Ch. 45.1 - Explain how animals with hydrostatic skeletons...Ch. 45.2 - Prob. 1LOCh. 45.2 - Prob. 2LOCh. 45.2 - Prob. 3LOCh. 45.3 - Prob. 1LOCh. 45.4 - Prob. 1LOCh. 45.4 - Prob. 2LOCh. 45.4 - Prob. 3LOCh. 45.5 - Prob. 1LO
Ch. 45.5 - Describe how friction and gravity affect...Ch. 45.5 - Prob. 3LOCh. 45 - Prob. 1IQCh. 45 - Exoskeletons and endoskeletons differ in that a....Ch. 45 - Worms use a hydrostatic skeleton to generate...Ch. 45 - Bone develops by one of two mechanisms depending...Ch. 45 - Which of the following statements best describes...Ch. 45 - Motor neurons stimulate muscle contraction via the...Ch. 45 - Prob. 6UCh. 45 - If you wanted to study the use of ATP during a...Ch. 45 - Place the following events in the correct order....Ch. 45 - You take X-rays of two individuals. Ray has been a...Ch. 45 - You have identified a calcium storage disease in...Ch. 45 - How do the muscles move your hand through space?...Ch. 45 - How can osteocytes remain alive within bone? a....Ch. 45 - Swimming underwater using forelimbs for propulsion...Ch. 45 - If a drug inhibits the release of ACh, what will...Ch. 45 - Prob. 1SCh. 45 - Prob. 2SCh. 45 - The nerve gas methylphosphonofluoridic acid...Ch. 45 - If natural selection favors the evolution of wings...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Elderly people should continue to engage in weight-bearing exercises in order to: Select one: O a. Strengthen their bone by stimulating growth in length O b. Decrease calcium resorption by inhibiting osteoblast O c. Strengthen their bone by stimulating bone growth in thick O d. Delay epiphyseal plate closurearrow_forwardWhich is not involved in the process of bone repair following a fracture: A. Fibroblasts produce collagen fibers to connect broken pieces of bone B. A fibrocartilaginous callus serves as a model for new bone growth C. Osteoclasts remove excess bone from the hard callus D. The fracture hematoma reorganizes to form a procallus D. No exceptions; all of the choices are involved in the process of bone repairarrow_forwardBone tissue can be described as a. dead calcified tissue b. cartilage c. the skeletal system d. dense, hard connective Issuearrow_forward
- Cartilage has the unique ability to contract to pull the bones and help the body move A. True B. Falsearrow_forwardWhich of the following statements about the developmental aspects of bone is inaccurate? a. in children and adolescents, bone formation is greater than bone resorption b. in old age, bone formation is less than bone resorption c. almost all bones are completely ossified by age 25 d. bone mass declines starting at age 40 e. None of the abovearrow_forwardInjury to bone heals more quickly than injury to cartilage because: a. bone marrow contains stem cells b. chondroblasts are only present during prenatal development c. the polysaccharides in cartilage ground substance can’t be replaced d. there is a richer blood supply to bone e. bone has a higher mineral contenarrow_forward
- Increasing bone size is considered Growth, while developing the ability to walk is considered Development: Select one: O a. False O b. Truearrow_forwardWhich of the following choices is CORRECT? A. trabeculae is the basic functional unit of compact bone B. Ca(PO.): (hydroxyapatite) is the inorganic minerals contained in bone extracellular matrix C. Testosterone is hormone that is used in hormone therapy to reduce osteoporosis in males D. Rickets is a condition that may cause bow legs in a child E. Parathyroid hormone (PTH) functions to decrease the level of calcium in the blood F. All of the above G. A, B, and E H. Both C and Darrow_forwardWhich of the following choices is CORRECT? A. trabeculae is the basic functional unit of compact bone B. Ca;(PO4); (hydroxyapatite) is the inorganic minerals contained in bone extracellular matrix C. Testosterone is hormone that is used in hormone therapy to reduce osteoporosis in males D. Rickets is a condition that may cause bow legs in a child E. Parathyroid hormone (PTH) functions to decrease the level of calcium in the blood F. All of the above G. A, B, and E H. Both C and Darrow_forward
- Running, or exercise/sports in general at the recreational level, is not associated with an increased risk of osteoarthritis of the lower limb joints. Why is this? Healthy cartilage is really good at repairing itself from damage in adulthood. Don't know for sure, but it's suspected that the strains involved trigger the cartilage to grow stronger, especially when young. O The peak loads these movements place on joints are small, similar to the peak loads in walking O The stress-life of cartilage is long enough that these activities cannot exhaust itarrow_forwardMatch the definitions with the correct term. osteoblast A. The layer that lines medullary cavity of a long bone B. epiphyseal fracture Stem cells for bone tissue that differentiates into other types of bone cells C. osteogenic cell In the structure of compact bone, circular layers of bone matrix that forms the D. periosteum osteons. concentric lamellae The process where bone tissues are continuously recycled and renewed with organic and mineral components of the bone matrix throughout life E. bone remodeling F. Which fracture can affect a child's growth in height if not treated carefully? endosteum G. H. greenstick fracturearrow_forwardYellow marrow isa. found mostly in children’s bones.b. found in the epiphyseal plate.c. important for blood cell production.d. mostly adipose tissuearrow_forward
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