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27 Under the exercise condition, the most heat-producing tissue is

A. muscles

B. fats

C. liver

D. blood

E. nerves

28 Heat transfer occurs by

A. radiation

B. conduction

C. convection E. above-mentioned all

D. evaporation

29 The basic nervous centre for body temperature regulation is

A. medulla oblongata B. pontine neurons D. spinal cord

E. brain cortex

C. hypothalamus

30 Aspirin can reduce fever because

A. it directly depresses body temperature B. it directly increases heat loss C. it directly decreases heat generation

D. it directly reduces temperature set point in the hypothalamus E. it directly lets person take behavioural measures against fever

PART Ⅲ Answer Question: （50 Points）

1 Please answer components of a typical ECG trace and each meaning. (8 Points)

2 What are determinants and regulation of RBF? (8 Points)

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3 How are pulmonary ventilation Influenced by PO2 ,PCO2 , and pH? (10 Points)

4 What are typical and common patterns of motility in different parts of gastrointestinal tracts? (8 Points)

5 What are functions of thyroid hormones ? (8 Points)

6 How does the human body’s reflex response to cold? (8 Points)

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苏州大学2005—2006学年度第一学期临床医学7年制生

生理学试题（双语B卷）2005，01

Physiological Test Paper (Type B) for Medical Student (7

year length of schooling)

Year 05 To 06, First Semester, Soochow University

Jan, 2005

ANSWER

PART Ⅰ Explanation of terminology:（20 Points）

1 Positive feedback: There are situations where the initial response produces further change in the same condition. This is self-perpetuating and is called positive feedback.

2 Antiporter: The carrier protein couples the movement of molecules in opposite directions, then it is called an antiporter and the molecules are said to be counter-transported.

3 Resting potential: Under the quiet or calm conditions (without any stimuli), the membrane displays the potential difference between inside and outside the cell.

4 Mean Arterial Pressure: MAP= Diastolic Pressure + 1/3 Pulse Pressure, about 100mmHg (13.3kPa).

5 Surfactant: The fluid lining the alveoli contains material, a phospholipid secreted by typeⅡ pneumocytes which lowers the surface tension of alveoli and cause surface tension to change with volume.

6 Basic electrical rhythm (BER): The basic electrical rhythm (BER) is a slow spontaneous depolarized wave in the GI tract and BER of smooth muscle cells form the basis (action potential) of stomach contractions.

7 Respiratory quotient: RQ=Mol number of producing CO2 in body per unit time / Mol number of consumptive O2 in body per unit time.

8 Renal reabsorption: Salt and water are reabsorbed in different parts of renal tubules into interstitial fluid and finally into the blood, which is named renal reabsorption.

9 Puberty: Onset of the special periods is marked by pulsatile secretion of GnRH, FSH, and LH both in male and female for body fast development.

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10 Core body temperature: It is the temperature of the interior of the body and is a controlled variable that is maintained within narrow limits.

PART Ⅱ Single Choice: （30 Points, Please Make Your Answer in TABLE） Number Answer Number Answer 16 E 17 A 18 A 19 C 20 B 21 B 22 D 23 A 24 B 25 D 26 B 27 A 28 E 29 C 30 D 1 A 2 C 3 C 4 D 5 B 6 E 7 B 8 E 9 C 10 D 11 C 12 E 13 D 14 E 15 C PART Ⅲ Answer Question: （50 Points）

1 Please answer components of a typical ECG trace and each meaning. (8 Points) Three major components of an ECG are P wave, QRS complex,T wave. P wave: atrial depolarization

QRS complex: depolarization of ventricles T wave: repolarization of ventricles

PR interval is the interval from the beginning of atrial activation to the beginning of ventricular activation.

QT interval is the required for ventricular depolarization and repolarization.

2 What are determinants and regulation of RBF? (8 Points)

RBF is determined by systemic arterial blood pressure and renal vascular resistance. RBF demonstrates autoregulation.

Autoregulation involves afferent not efferent arterioles.

Autoregulation is explained either by the myogenic hypothesis or tubuloglomerular feedback.

3 How are pulmonary ventilation Influenced by PO2 ,PCO2 , and pH? (10 Points)

Two groups of chemoreceptors, medullary and peripheral, send afferent information to the medulla and influence the depth and rate of respiration.

Medullary chemoreceptors are sensitive to pH and increase ventilation when pH falls. Peripheral chemoreceptors are sensitive to pH↓, PO2↓ , and PCO2↑, with PCO2 being most effective.

Sensitivity of the peripheral chemoreceptors is influenced by pH,. PO2 , and PCO2.

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