Over 40% of blood volume consists of oxygen-transporting cells called a) platele

Question

Over 40% of blood volume consists of oxygen-transporting cells called a) platelets. b) plasma. c) serum. d) fibrinogen. e) erythrocytes. Insects have a respirators system that is based on a) gills. b) lungs. c) a tracheal system. d) their skin. e) blood vessels. Which of the following options correctly lists the direction of air travel as it exits the body? a) trachea, bronchioles, bronchi, pharynx, larynx, alveoli b) alveoli, bronchioles, bronchi, trachea, larynx, pharynx c) bronchi, larynx, pharynx, bronchioles, trachea, alveoli d) bronchioles, trachea, pharynx, bronchi, larynx, alveoli e) pharynx, larynx, bronchioles, bronchi, trachea, alveoli The alveoli of the lungs a) are filled with blood. b) connect directly to the trachea. c) have rings of cartilage that keep them open. d) filter and humidify the air. e) are the place where O_2 and CO_2 are exchanged between the air and the blood. Outside air enters the lungs in humans because a) the air pressure increases in the bronchioles b) a sphincter at the beginning of the trachea opens. c) there is high air pressure in the alveoli. d) the diaphragm and the rib muscles contract. e) the vocal cords relax. Reproductive cycles of animals are controlled by a) hormones b) environmental factors c) seasonal temperature d) all of the above e) none of the above Which of the following environments is almost always required for external fertilization? a) A very dry habitat. b) A cold habitat. c) A hot habitat. d) A moist or aquatic habitat. e) None of the above. Sexual reproduction in animals always requires a) fertilization, the union of sperm and eggs. b) production of spores. c) cloning of animals. d) an aquatic environment. e) fragmentation of a single parent The follicle mostly secretes a) estrogen b) progesterone c) LH d) FSH e) androgen Which of the following produces the sperm cells? a) prostate gland b) vas deferens c) testis d) seminal vesicles e) bulbourethral gland Which of the following produces male sex hormones? a) prostate gland b) vas deferens c) testis d) seminal vesicles e) bulbourethral gland The female external reproductive structures include a) the uterus b) the oviducts c) the clitoris and the labia d) the ovaries e) the vagina Which of the following cell types produce large amounts of androgens? a) Sertoll cells. b) Follicle cells. c) Sperm cells. d) Oocytes. e) Leydig cells. Which of the following hormones triggers ovulation and corpus luteum formation? a) estrogen b) releasing hormones c) FSH d) progesterone e) LH Fertilization forms a a) oocyte b) zygote c) blastula d) gastrula e) larva

Explanation / Answer

15.e

Erythrocyte(origin greek) Erythro:red Cyte:cells

It contains haemoglobin and carries oxygen to body tissues.

16.c

Insects have a respiratory system of rigid internal tunes. These are called the trachea.

17.b

18.e

Alveoli are small air sacs inside the lungs. These Alveoli are responsible for the exchange of oxygen and carbon dioxide between the air and the blood.

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