How does the reproductive system contribute to osteoporosis?
A. Excessive smoking lowers estrogen levels, which increases bone loss.
B. Immune cells decrease in number after puberty and reduce bone repair.
C. Decreased estrogen levels following menopause contribute to the disease.
D. Calcium ions released from the bones are necessary for gamete production.
E. Lack of sex hormone production reduces vitamin D production and decreases calcium absorption.
Answer: C
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Which of the following occurs during the latent period of muscle contraction?
A) An action potential is generated. B) Calcium is released from the sarcoplasmic reticulum. C) Acetylcholine is released at the axon terminal and an action potential is generated. D) Acetylcholine is released at the axon terminal
Nerve signals from the general body senses travel up the spinal cord to the thalamus and then to the
A. visual area of the occipital lobe. B. primary motor area of the frontal lobe. C. somatosensory area of the parietal lobe. D. prefrontal area of the frontal lobe.
All vaccinations offer complete protection from the intended disease
Indicate whether the statement is true or false
When a clot is no longer needed, fibrin is dissolved by ________.
A. plasmin B. thromboplastin C. platelet-derived growth factor D. prothrombin E. kallikrein