Sarcomeres Study guides, Class notes & Summaries

entry of which ion prevents tetanus in cardiac myocytes? correct answer: Ca2+ 'funny' sodium channels are odd because they ________ correct answer: are activated by hyperpolarization instead of depolarization the wing muscles of hummingbirds rely on ________ to produce sound correct answer: twitches of short duration what is thought to explain the increase in force achieved by tetanus contractions relative to a single twitch? correct answer: complete stretching of elastic elements...

Which of the following best characterizes the structure of DNA? RATIONALE    Double-stranded  Both single and double-stranded  Triple-stranded  Single-stranded MILESTONE 63/70 CONCEPT  Organic Compounds: Nucleic Acids 2 CONCEPT  The Sliding Filament Model DNA is a double-stranded nucleic acid that contains the genetic information responsible for the development and function of cells and organisms. Which of the following is the primary protein that ma...

Pre-Lab Questions 1. How do banding patterns change when a muscle contracts? When a muscle contracts, the banding patterns within the muscle change due to the sliding filament theory of muscle contraction. This theory suggests that muscle contraction occurs when thin filaments (actin) slide over thick filaments (myosin), resulting in the overlapping of these filaments and shortening of the sarcomeres, which are the basic contractile units of the muscle. As a result, the dark A bands, which...

Straighterline Anatomy Final, Straighterline Anatomy & Physiology Exam What is the smallest level of organization in the body that contains the body's genetic information? a. chemical b. cellular c. tissue d. organism -Correct Answer-cellular The cellular level includes the nucleus, an organelle that contains the body's genetic information. Which is an example of a normally occurring positive-feedback mechanism? Select one: a. elevated blood pressure during exercise b. increase in ...

What are the vessels that bring blood back to the heart? - ANSWERS: Superior and inferior vena cava what chamber of the vena cava go into? - ANSWERS: right atrium what determines heart rate? - ANSWERS: SA Node where is the SA node located? top of right atrium below where the superior vena cava comes in - ANSWERS: what structures are the end of cardiac cells joined at? - ANSWERS: Intercalated disks what is a desmosome? - ANSWERS: contained in intercalated disks - collagen fibers...

Straighterline Anatomy Final, Straighterline Anatomy & Physiology Exam 2024 What is the smallest level of organization in the body that contains the body's genetic information? a. chemical b. cellular c. tissue d. organism -Answer-cellular The cellular level includes the nucleus, an organelle that contains the body's genetic information. Which is an example of a normally occurring positive-feedback mechanism? Select one: a. elevated blood pressure during exercise b. increase in hea...

The EDV of two female patients of similar body mass and height is measured. Patient 1 has an End Diastolic Volume of 110 mLs. Patient 2 had an EDV of 85 mLs. Which patient has a larger stroke volume? correct answer: patient 1 Which patient has more overlap in the cardiac sarcomeres prior to ventricular systole? correct answer: patient 2 what regulates heart rate? correct answer: - average heart rate is about 75 beats/minute - without nervous system control the heart would beat about ...

A&P Straighteline Final ACTUAL EXAM QUESTIONS AND REVISED CORRECT ANSWERS | UPDATED !! What is smooth muscle tone? Select one: a. can rapidly develop action potentials b. shallow invaginations of cell membrane c. relatively constant tension maintained for a period of time d. intracellular cytoskeleton e. enzyme that removes phosphate from myosin - ANSWER : c. relatively constant tension maintained for a period of time The sites where a chemical substance is transmitted from the ...

A&P 1 Final Exam, Straighterline Anatomy and Physiology 1, Straighterline A&P 1 Cumulative Final 100% Pass What is the smallest level of organization in the body that contains the body's genetic information? Select one: a. chemical b. cellular c. tissue d. organism B. Cellular The cellular level includes the nucleus, an organelle that contains the body's genetic information. Which is an example of a normally occurring positive-feedback mechanism? Select one: a. elevated...

Which of the following is NOT a function of the digestive tract? a) to use enzymes to break down food b) to perform gas exchange c) to remove waste from the body d) to use peristalsis to move food along - b) to perform gas exchange Gas exchange is a function of the respiratory system The body, at all times, attempts to maintain homeostasis. The best definition of homeostasis is: a) a process that maintains the stability of the human body's internal environment in response to changes ...