Which of the following is not a way muscle contractions can be graded?
A) changing the frequency of stimulation
B) changing the strength of the stimulus
C) changing the type of muscle fibers involved in the contraction
D) changing the type of neurotransmitter released by the motor neuron
C) changing the type of muscle fibers involved in the contraction
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Saliva is
A) stimulated by sympathetic innervation. B) slightly acidic, with a pH of 6-7. C) secreted from endocrine glands. D) slightly acidic, with a pH of 6-7 and controlled by the autonomic nervous system. E) controlled by the autonomic nervous system.
This organelle digests other worn-out organelles and foreign substances that have entered the cell
A) peroxisome B) Golgi apparatus C) lysosome D) endoplasmic reticulum
The type of connective tissue that contains chondrocytes, a rigid matrix of collagen fibers and proteoglycan-hyaluronic acid aggregates and few, if any, blood vessels is
A. muscle tissue. B. fibrous connective tissue. C. adipose tissue. D. bone tissue. E. cartilage.
________ carry blood to the heart.
A. Capillaries B. Arteries C. Veins