Chapter 1: Introduction to Physiology & Homeostasis

Which one of the following is NOT true about homeostasis?

• Homeostasis refers to a state of dynamic constancy.

• Negative feedback loops are important in maintaining homeostasis of physiological parameters.

• Homeostasis ensures that physiological parameters are maintained exactly at the set point value.

• Homeostasis is not the same as hemostasis.

• None of the above is true.

In the mammalian body plan, no cell is more than approximately __________ away from a capillary.

• 10 nm

• 100 nm

• 1 μm

• 10 μm

• 100 m

Which of the following is (are) directly responsible for the generation of the resting membrane potential?

• Ionic gradients across the plasma membrane

• Permeability of the plasma membrane to various ions

• The Na⁺/K⁺ ATPase

This integral membrane protein is responsible for the formation of the gap junction channels of electrical synapses:

• Na⁺/K⁺/ATPase

• Connexin

• Voltage-gated Na⁺ channel

• Voltage-gated K⁺ channel

• Voltage-gated Ca²⁺ channel

Which of the following are ligand-gated ion channels?

• Nicotinic cholinergic receptors

• Muscarinic cholinergic receptors

• Adrenergic receptors

• B and C only

• A, B, and C

Which of the following are G-protein coupled receptors?

• Nicotinic cholinergic receptors

• Muscarinic cholinergic receptors

• Adrenergic receptors

• B and C only

• A, B, and C