BIOL 2160 Exam 4 Kahoot

which of these is a single muscle cell?

muscle fiber

where is the motor plate located?

on the muscle membrane

which protein physically covers up myosin binding sites on actin?

tropomyosin

where are Ryanodine receptors found?

on the sarcoplasm reticulum membrane

when bound to ATP, myosin has a ___ affinity for actin

low

which event immediately result in the power stroke?

removal of the inorganic phosphate

during an ___ twitch, the muscle actually shortens

isotonic

which type of muscle fiber will be darker in color?

oxidative

during low intensity exercise, fatigue results from

depletion of glycogen

during smooth muscle contraction, Ca++ binds to

calmodulin

which valve allows blood flow into the left ventricle?

mitral/bicuspid valve

which is the only vein in the human body to transport oxygenated blood?

pulmonary vein

when pressure is lower in the left ventricle than in the left atrium, the aortic semilunar valve will be

closed

where would you generally expect pressure to be higher?

pulmonary artery

where would you expect CO2 levels to be higher?

systemic veins

which channels allow cardiac pacemaker cells to reach threshold?

T-type voltage-gated calcium channels

when “funny” channels open, the cell’s permeability to K+ goes

down

which of these is true during isovolumetric contraction?

atrial < ventricular < aortic

which phase is the only phase in which ventricular pressure is greater than aortic pressure?

phase 3

where would you expect the partial pressure for oxygen to be higher?

alveoli

swallowing will cause the epiglottis to cover up the opening to the

trachea

which part of the respiratory tract functions most similarly to veins and arteries?

conducting zone

during inspiration the diaphragm will be

contracted

during expiration, the volume of the lungs

decreases

if air pressure in a room = 700 mm Hg, and is 70% N, what is the partial pressure of N?

490 mm Hg

the partial pressure for oxygen will be higher

in systemic capillaries

which of the following is a normal pysiological response?

hyperpnea

which of the following will result in blood CO2 levels that are too high?

hypoventilation

what does Ca-Calmodulin bind to?

MLCK

which of the following is missing in smooth muscle?

sarcomeres

what is the purpose of DHP receptors?

detect the action potential on the t-tubules

funny channels are permeable to

both Na and K

why are action potentials so slow in contractile cells?

to establish a longer refractory period

which of these changes most often?

alveolar pressure