During exercise, blood flow to skeletal muscles increases. The initial response that increases blood flow is automatic and independent of the nervous and endocrine systems. Which type of homeostatic regulation is this? Why?
The initial increase in blood flow to active muscles is an example of autoregulation. For example, when oxygen levels decline in a tissue, the cells release chemicals that dilate local blood vessels. This dilation increases the rate of blood flow and provides more oxygen to the region even before responses from the nervous or endocrine system take place. Autoregulation does not require the nervous or endocrine system.
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Proteins that are embedded within and extend across the phospholipid bilayer are called ________ proteins.
A. cytoskeleton B. catalytic C. peripheral D. integral
Which of the following most accurately describes how foreign substances can activate complement?
A. Foreign proteins are phagocytized by macrophages and directly activate complement. B. Foreign substances can bind to spontaneously activated C3 and stabilize it. C. Both "Antibodies can bind to foreign antigens and activate complement through the classical pathway" and "Foreign substances can bind to spontaneously activated C3 and stabilize it" are correct. D. Foreign proteins bind to C1 and activate it. E. Antibodies can bind to foreign antigens and activate complement through the classical pathway.
Which of the following organelles provide additional surface area for absorption?
A. Microvilli B. Flagella C. Cilia D. Centrioles E. Ribosomes
Ribosomal RNA is formed by
A) the endoplasmic reticulum. B) nucleoli. C) Golgi complexes. D) lysosomes. E) mitochondria.