How are simple diffusion and facilitate diffusion similar? Different? Use specific examples to explain
What will be an ideal response?
Diffusion is always passive, so both processes do not require the cell to expend energy. In both cases, the particle is moving across the membrane from a higher to lower concentration. In simple diffusion, the particle is lipid soluble and can pass unaided through the membrane. O2 is an example of a substance that moves by simple diffusion. In facilitated diffusion, the particle is too large to pass through the membrane and too large to move through a channel. So a special transport protein helps or facilitates the movement of the particle across the membrane. Glucose is an example of such a molecule.
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The iliac fossa is found in which region of the ilium?
A. The anterior surface B. The posterior lateral surface C. The posterior surface above the anterior gluteal line D. Superior to the acetabulum E. The posterior medial surface
Blood cells and antibodies pass freely across the placenta.
Answer the following statement true (T) or false (F)
This figure shows the bones of the ankle and foot. What view is shown?
A. Lateral view of right ankle and foot B. Superior view of right ankle and foot C. Ventral view of right ankle and foot D. Superior view of left ankle and foot E. Inferior view of left ankle and foot
A postsynaptic neuron has three presynaptic inputs - from neurons X, Y, and Z. When X and Y are stimulated simultaneously and repeatedly, the postsynaptic neuron reaches threshold and undergoes an action potential
When X and Z are stimulated simultaneously, however, there is no change in the membrane potential of the postsynaptic neuron. The simultaneous stimulation of X and Y is an example of A. temporal summation. B. presynaptic inhibition. C. spatial summation. D. neuronal divergence. E. presynaptic facilitation.