Exam 2: Cell Physiology

Net diffusion of water down its own concentration gradient toward an area of higher solute concentration is known as ____________________.

The sarcoplasmic reticulum stores ____________________ ions.

The hydrophobic interior of the lipid bilayer of the plasma membrane blocks the passage of water-soluble substances.

During the absolute refractory period, the Na⁺ gates are not capable of opening again in response to another triggering event.

Match the terms, labelled a. through d., to their descriptions. (Options may be used more than once or not at all.) a.microtubules b.microfilaments c.intermediate filaments d.micro trabecular lattice -form the mitotic spindle

Glucose is usually reabsorbed from the filtrate in the kidney back into the blood through carrier proteins; hence, glucose in the urine is considered abnormal. What of these conditions can result in glucose in the urine?

At the equilibrium potential for an ion, its ____________________ gradient is exactly counterbalanced by its electrical gradient.

Where is the nucleus of a neuron housed?

The large protein anion does not leave the cell because there is no concentration or electrical gradient to drive it outward.

Match the terms, labelled a. through f., to their correct descriptions. (Options may be used more than once or not at all.) a.plasma membrane b.nucleus c.cytoplasm d.cytosol e.organelles f.cytoskeleton -houses the cell's DNA

The nucleus indirectly governs most cellular activities by directing the kinds and amounts of various enzymes and other proteins that are produced by the cell.

The neuronal relationship in which many presynaptic cells terminate on a single postsynaptic cell is called ____________________.

The plasma membrane is not impermeable, but it is ____________________.

Anions tend to move toward a negatively charged area.

Fibronectin is the extracellular matrix component that provides tensile strength.

Which of these statements is correct for nicotinamide adenine dinucleotide (NAD)?

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) a.The ion tends to be moved into the cell by this force. b.The ion tends to be moved out of the cell by this force. -concentration gradient for Na⁺ at resting potential

Which of these statements is correct for collagen?

If two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.

Match the vesicles, labelled a. through c., with their characteristics. (Options may be used more than once or not at all.) a.transport vesicles b.coated vesicles c.secretory vesicles -contents become concentrated over time