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Week 7 Pysiology
| Question | Answer |
|---|---|
| Effectors can be described as | organs that directly influence controlled physiological variables. |
| Which of the following is a basic component of every feedback control loop? | All of these are components of a feedback control loop. (Sensor mechanism, integrating center, effector, feedback) |
| Homeostasis can best be described as | a state of relative constancy. |
| Shivering to try to raise your body temperature back to normal would be an example of | Both A and C. (the body trying to maintain homeostasis, a negative-feedback mechanism. ) |
| All proteins have which four elements? | carbon, oxygen, hydrogen, and nitrogen |
| In base pairing of DNA molecules, _____ is bound to _____. | adenine; thymine |
| Unsaturated fats- | will kink or bend because of the double bonds between the carbon atoms. |
| Which lipid acts as a “tissue hormone”? | Prostaglandin |
| Meiotic division occurs in | primitive sex cells. |
| A chemical that reduces the amount of activation energy needed to start a chemical reaction is a(n) | catalyst |
| Water will move through the cell membrane by? | osmosis. |
| A membrane carrier structure attracts a solute to a binding site, changes shape, and releases the solute on the other side of the cell membrane. This describes the process of: | carrier-mediated transport. |
| Fingernail growth is the result of the mitosis of the cells in the stratum: | germinativum. |
| The nail body forms at the nail root, which has a matrix of proliferating cells from the _____________ that enables the nail to grow continuously. | stratum basales |
| Mucous membranes are important because they lubricate and protect passageways. | true |
| In what area of the body would you expect to find an especially thick stratum corneum? | Sole of the foot |
| What is are the two types/functions of bone marrow? | Red & yellow – produces red blood cells and stores energy as fat. |
| When an astronaut is in space for 2 months what may happen to their bone density as compared to a person living on earth? | The astronaut will experience bone loss at an increased rate as a person on earth |
| Small cells that synthesize and secrete a specialized organic matrix are? | osteoblasts. |
| An age-related skeletal disease that is characterized by loss of bone mineral density and increased bone fragility is | osteoporosis. |
| The structure of the knee joint permits movements of | flexion and extension. |
| Which of the following is not among the structures that characterize synovial joints? | tendons |
| Tilting the foot upward, decreasing the angle between the top of the foot and the front of the leg, is called? | dorsiflexion. |
| Thick myofilaments extend the length of the? | A-band. |
| The tiny bulge at the end of a terminal branch of a presynaptic neuron’s axon is called a(n) | synaptic knob. |
| Which membrane receptor acts to directly change ion permeability when stimulated? | Gated-channel receptor |
| Within the nervous system, coding for the strength of a stimulus is accomplished through? | the frequency of nerve impulses. |
| Dopamine, epinephrine, and norepinephrine are classified as? | catecholamines. |
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