問題詳情
23. How are the action potentials of pacemaker cells spread to other cardiac cells?
(A) via cardiac innervation
(B) via neuromuscular junctions
(C) by the sudden and instantaneous depolarization of all cardiac cells
(D) via gap junctions
(E) A and B
(A) via cardiac innervation
(B) via neuromuscular junctions
(C) by the sudden and instantaneous depolarization of all cardiac cells
(D) via gap junctions
(E) A and B
參考答案
無參考答案
內容推薦
- MPF (maturation-promoting factor) turns itself off by(A) activating an enzyme that dissociates c
- Aphids reproduce asexually or sexually. They are likely to rely on asexual reproduction when(A)
- 商業上俗稱之「熟肉」，通常是用於製作(A)貢丸(B)肉鬆(C)香腸(D)熱狗。
- Membranes from cells grown in media enriched with stearate are less fluid than normal membranes.
- The first group with flowers was the(A) angiosperms. (B) algae. (C) fern allies. (D) ferns. (E) g
- 五代十國的相關敘述，以下何者正確？(A)五代的開始於朱溫篡位(B)所謂五代是指東晉、宋、齊、梁、陳(C)十國大多建國在北方、五代則位於南方(D)本質上為隋末藩鎮割據的延續。
- 唐朝和東漢衰亡原因，有許多共同之處，以下何者錯誤？(A)宦官亂政(B)地方割據(C)人民叛亂(D)外戚專權。
- 張錡利用假日看了一本書，書中提到王莽、劉裕、楊堅…等人的事蹟，請問：這本書的書名為何？(A)《歷代篡位建國者》(B)《歷代外戚干政史》(C)《歷代賢君明相》(D)《歷代外交探險家》。
- Which of the following compounds does NOT react with acetyl chloride?(A) C2H5OH (B) C6H6 + AlCl3
- Almost all of the major animal phyla we see today appeared in the fossil record at the beginning
內容推薦
- The plasma cell is specialized for the production and secretion of antibodies, and thus contains
- Why do the kidney’s activities require large amounts of energy?(A) Filtration requires high bloo
- Birds are like their reptile ancestors, but their bodies are highly modified for flight. Which o
- Hypophosphatemia is inherited as an X-linked dominant. A woman without hypophosphatemia and a ma
- Where is the attachment site for RNA polymerase?(A) operator region (B) initiation region(C) str
- All of the following are reasons why gas exchange is more difficult for aquatic animals than it
- Which of the following is an example of polygenic inheritance?(A) skin pigmentation in humans (B
- The percentage of the human genome that encodes proteins is approximately(A) 90 %. (B) 70 %. (C)
- Gene flow is a concept best used to describe an exchange between(A) individuals. (B) chromosomes
- 某個作用於剛體(rigid body)的力 ，該力對於作用點 O 的位置向量(position vector)是 ， 與 的夾角是θ ，點 O 至該力向量的垂直距離是 d，下列何者為錯誤的力矩(m
- The primary role of oxygen in respiration is to(A) combine with carbon, forming CO(B) catalyze
- The nuclear envelope breaks down at the end of(A) S phase. (B) G2 phase. (C) prophase. (D) metap
- Which of the following substances is incorrectly matched with its producer?(A) aldosterone--kidn
- A long-day plant will flower if(A) it is kept in continuous far-red light.(B) the duration of co
- Which of the following may explain genomic imprinting?(A) post-translational modification of pro
- The repeated use of insecticides may lead to the evolution of insecticide resistance in insects.
- Differentiation of teeth is greatest in(A) reptiles. (B) mammals. (C) bony fishes. (D) sharks. (
- Archaeopteryx(A) was a transitional form between birds and mammals.(B) had feathers and had no t
- Genetic variation is the result of all but(A) the role of environment in controlling genetic exp
- Biomes are(A) recognized on the basis of the dominant animal life.(B) all of the populations of
- The first plants arose during the __________ era.(A) Cenozoic (B) Mesozoic (C) Paleozoic (D) Pre
- Which of the following statements about movement corridors is true?(A) A movement corridor conne
- Which of the following combination is correct?(A) Porifera – coelomate, branch radial.(B) Nemato
- Consider a field plot containing 200 kg of plant material. How many kg of carnivore production c
- A person suffering from AIDS would be unlikely to suffer from which of the following diseases?(A