Physiology

Question 1

What type of receptor does the PNS activate at an effector organ?

Answer 1

Muscarinic

Question 2

An excitable membrane will become depolarized upon influx of which ion?

Answer 2

Na

Question 3

Stimulation of which tract causes an involuntary contraction of an excitatory extensor?

Answer 3

Vestibiulospinal

Question 4

Piling up of inadequate stimuli to threshold value and eventual action potential is termed?

Answer 4

Summation

Question 5

Which is unique to cardiac muscles?

Answer 5

Contains intercalated discs

Question 6

Motor units

Answer 6

Consist of a motor neuron and all of the muscle fibers it innervates

Question 7

The “I” bands in a sarcomere are made up of?

Answer 7

Actin

Question 8

The greater the heart is filled during systole, the greater will be the force during systole. This is known as/

Answer 8

Starlings law

Question 9

The p wave on a ekg represents

Answer 9

Atrial depolarization

Question 10

What events results in the s1 heart sound?

Answer 10

Closure of AV valves

Question 11

Which is present in both coagulation cascade pathways?

Answer 11

C-3

Question 12

Total lung capacity can be defined as?

Answer 12

Vital capacity + residual vol

Question 13

What is the respiratory adjustment to decreased CO2 in the blood?

Answer 13

Decreased respiration depth and rate

Question 14

The greatest percentage of infiltrated water is reabsorded in the?

Answer 14

Proximal Convoluted Tubule

Question 15

Lymphatic tissue is primarily found in?

Answer 15

Skin and Gut

Question 16

Calcium absorption in the GI tract is increased by the action of which vitamin?

Answer 16

D

Question 17

Which is not a protein difesting enzyme of the GI system?

Answer 17

Amylase

Question 18

The suckling reflex in the infant stimulates the release of which hormone from the posterior pituitary gland?

Answer 18

Oxytocin

Question 19

Testosterone is produced and secreted by?

Answer 19

Interstitial cells of Leydig

Question 20

When exercising a muscle which type of contraction does not change the length of the muscle?

Answer 20

Isometric

Question 21

When a neuron is in a facilitated state, the membrane of its soma is?

Answer 21

Close to threshold potential

Question 22

Which region of the brain inhibits contraction of skeletal muscle that opposes the intended movement?

Answer 22

Basal ganglia

Question 23

Slow pain fibers do all of the following except?

Answer 23

Activate spinal reflexes

Question 24

Which region of the brain regulates temperature control, food intake, and reproductive function?

Answer 24

Hypothalamus

Question 25

Which characteristic does cardiac muscle share with skeletal muscle?

Answer 25

It has sarcomeres

Question 26

Slow oxidative muscle fibers

Answer 26

Have smaller diameters than fast anaerobic fibers

Question 27

Which statement about visceral smooth muscle is true?

Answer 27

It can develop more tension per cubic centimeter than skeletal muscle

Question 28

When negative feedback processes are working correctly, failure of the thyroid gland to secrete thyroid hormone in response to thyroid stimulating hormone will result in?

Answer 28

Increase secretion of TSH

Question 29

Growth hormone secretion can be stimulated by all of the following except?

Answer 29

Elevated blood glucose

Question 30

Negative feedback regulation of FSH is provided by?

Answer 30

Testosterone

Question 31

Which physical characteristic enhances the ability of muscle cells to use oxygen?

Answer 31

Increased mitochondria

Question 32

Abnormally slow depolarization of the ventricles would most change the shape of the ____ in an ECG

Answer 32

QRS complex

Question 33

The vol of blood ejected from each ventricle during a contraction is called the?

Answer 33

Stroke volume

Question 34

Total peripheral resistance is related to all of the following except the?

Answer 34

Osmolarity of intersitial fluids

Question 35

When the diaphragm and external intercostals mucles contract

Answer 35

The volume of the thorax increases

Question 36

Most of the oxygen transported in the blood is ?

Answer 36

Bound to hemoglobin

Question 37

The ions in highest conc in the ECF are?

Answer 37

Sodium and chloride

Question 38

The glomerulus differes from other capillaries in the body that it

Answer 38

Is drained by an efferent arteriole

Question 39

The enzyme pepsin breaks down?

Answer 39

Proteins

Question 40

The mechanical and chemical receptors that control digestive activity are located?

Answer 40

In the walls of the tract organs