pancreatic secretions that aid in digestion of food are produced by which of the following types of cells?
a. islet alpha cells
b. islet beta cells
c.
... [Show More] acinar cells
d. sphincter cells
c. acinar cells
which of the following is the collagen rich material that connects muscles to bones?
a. tendon
b. ligament
c. reticular tissue
d. areolar tissue
a. tendon
which of the following statements best explains why RNA inside a cell is almost never found as a single stranded molecule?
a. alleles for genes are found in pairs, so their RNAs also pair up
b. RNA normally exists with its complimentary strand within a double helix
c. RNA and DNA form hybrid pairs for all transcribing parts of the chromosome
d. shorts stretches of complimentary sequences can cause RNA to fold back on itself
d. short stretches of complimentary sequences can cause RNA to fold back on itself
which of the following is the circular muscle that regulates opening and closing of a body aperture?
a. fosa
b. fascia
c. sphincter
d. valve
c. sphincter
the sliding filament theory proposes that which of the following occurs during the contraction phase of muscle?
a. the sarcomeres shorten
b. myosin degenerates
c. actin binds calcium ions
d. ATP is produced by myosin
a. the sarcomeres shorten
which of the following is an irregular bone of the throat that aids in tongue movement and swallowing?
a. stapes
b. hyoid
c. ischium
d. calcaneus
b. hyoid
which of the following hormones is involved in the process of labor and childbirth?
a. luteinizing hormone
b. gonadotrophin releasing hormone
c. thyroxine
d. oxytocin
d. oxytocin
which of the following is a type of specialized antigen-processing cell that activates T-cells of the immune system?
a. plasma cells
b. thrombocytes
c. dendritic cells
d. eosinophils
c. dendritic cells
mammary glands are a modified type of which of the following glands?
a. sebaceous glands
b.endocrine glands
c. eccrine glands
d. apocrine glands
d. apocrine glands
which of the following options lists the correct order of events in a signaling pathway in a feedback loop used to maintain homeostasis?
a. receptor, effector, integration, stimulus, response
b. receptor, stimulus, integration, response, effector
c. stimulus, effector, integration, receptor, response
d. stimulus, receptor, integration, effector, response
d. stimulus, receptor, integration, effector, response
which of the following pairs of endocrine glands are linked by a venous blood portal system?
a. liver and pancreas
b. hypothalamus and anterior pituitary
c. pancreas and spleen
d. anterior pituitary and thyroid
b. hypothalamus and anterior pituitary
adipose tissue is stored in which of the following layers of the skin?
a. epidermis
b. dermis
c. hypodermis
d. dermal papillae
c. hypodermis
which of the following causes lactic acid to build up in muscle cells?
a. the lack of oxygen leading to increased fermentation
b. an excess of carbon dioxide redirected to make lactic acid
c. the decrease in. glucose supply to the muscle
d. an increase in blood supply to the muscle
d. the lack of oxygen leading to increased fermentation
which of the following fetal tissues contributes to the formation of the placenta?
a. hematopoietic cells
b. embryonic yolk sac
c. fetal chorionic tissue
d. fetal muscle tissue
c. fetal chorionic tissue
which of the following events describes an acquired (adaptive) immune response?
a. B-cells release antibodies targeted to a bacterial pathogen
b. macrophages migrate to a site of infection to engulf pathogens
c. lysozymes digest microbial cells walls
d. complement proteins mediate reactions leading to the lysis of invading cells
a. b-cells release antibodies targeted to a bacterial pathogen
which of the following results from the immune system attacking an individual's own healthy tissue?
a. lupus
b. AIDS
c. asthma
d. atherosclerosis
a. lupus
three liquids are being studied. samples of liquid 1 and liquid 2 are placed in a container together. liquid 1 rises to the top. another sample of liquid 1 is placed in a different container together with liquid 3. this time, liquid 3 rises to the top. if all three liquids are layered in one container, which of the following would be the correct order of the liquids from top to bottom?
a. 2,3,1
b. 3,2,1
c. 1,3,2
d. 2,1,3
d. 2, 1, 3
plants return water from their leaves to the atmosphere as water vapor. what is the name of this process?
a. sublimation
b. transpiration
c. accumulation
d. condensation
b. transpiration
which of the following is the main energy-generating organelle of a sperm cell?
a. acrosome
b. mitochondria
c. axoneme
d. nucleus
b. mitochondria
if an investigation is designed to find the rate of respiration, which of the following must be measured as the independent variable?
a. time
b. mass
c. volume
d. density
a. time
in which of the following locations do most of the white blood cells originate?
a. bone marrow
b. pancreas
c. spleen
d. large. intestine
a. bone marrow [Show Less]