Which of the following contribute to muscle weakness in an elderly person? Select all that apply.
_____ Aged muscle has fewer motor neurons.
_____ Aged muscle has fewer myofibrils.
_____ Aged muscle has more fat and fibrous tissue.
_____ Aged muscle contains disorganized sarcomeres.
__X__ Aged muscle has fewer motor neurons.
__X__ Aged muscle has fewer myofibrils.
__X__ Aged muscle has more fat and fibrous tissue.
__X__ Aged muscle contains disorganized sarcomeres.
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The substance commonly transported during facilitated diffusion is ________
A) Glucose B) Potassium C) Cytoplasm D) Sodium
When blood passes through systemic capillaries, the oxygen saturation of hemoglobin changes
A. from about 99% saturated to about 25% saturated. B. from about 70% saturated to about 99% saturated. C. from about 98% to about 75% saturated. D. from about 40% to about 80% saturated.
Lymphatic vessels recover about ________ of the fluid filtered by capillaries
A) 50% B) 5% C) 25% D) 85% E) 15%
________ and respiratory movements move lymph upward through lymphatic vessels and trunks below the heart.
A. Heart contractions B. Osmotic pressure C. Skeletal muscle contractions D. Movement of internal organs